Special and unusual editions found here.  I've labeled the sections Deluxe (as defined by the publisher), Library Bound and Large Print (many of these are both), Graphic Novel, and Play Scripts.  Graphic novels and plays contain the full story, but not the complete text.
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The Hobbit Deluxe Editions
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Houghton Mifflin Collectors Edition  1973
Green leatherette, Slipcase, Illustrated by J.R.R. Tolkien
Again, copyright 1966 the only date found in most of these.  In more recent years they are dated 1997.  --> Read more about this edition... Still available new.  RRP $12.50 - $35.00
ISBN:  0395177111
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Houghton Mifflin 50th Anniversary Collectors Edition  1987
Gold leatherette, matching slipcase, green deckled edges, Illustrated by J.R.R. Tolkien.  If the edges aren't green, it is a Book club edition, most of which have gold top stain and two undecorated edges, and are blind stamped to the lower rear cover.  These are often listed using the incorrect ISBN 0395454026.  RRP for the trade edition $24.95
ISBN:  0395177111
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Easton Press  1984
Leatherbound, ribbed spine, AEG in 22k gold, moire endpapers and ribbon marker.  Frontispiece by Michael Hague.  Sold only in a 5 volume set including The Silmarillion and The Lord of the Rings in three volumes, at www.eastonpress.com
RRP for the set, $? - $395
ISBN:  N/A
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2012 Deluxe Pocket 75th Anniversary Edition
Houghton Mifflin Harcourt.  Leatherette cover and gilt edges.  They could have at least done it in red-?  Ah, well... go grab your novelty, if you will... RRP  $19.95
ISBN:  0544045521   9780544045521
Library and Large Print Editions
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Houghton Mifflin  1942
Who bound them is unknown, but the earliest example I've seen is a second printing.  The image is a 19th HMCo printing.  Some HMCo volumes were bound in covers with no decoration on the front.
ISBN:  None or N/A
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Ballantine  1966
Library bound mass market paperback editions between 1967 to around 1985 featured a recent (not necessarily current) Ballantine cover.  A rebound copy did not have a separate ISBN that anyone except a librarian might know about.
ISBN:  None or N/A
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Ballantine / Del Rey  1982
This library binding cover (Michael Herring?) apparently was used in addition to the Darrell Sweet covers and instead of the '86 Tolkien cover.  It was used only for library binding (which explains how it made this list), but may have been in production for many years (1983 - 1992 ?).
ISBN:  -
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Sagebrush / Econo-Clad Books / Tandem Library / Topeka Bindery / Turtleback  1989
Library Binding Edition.  This used to be a re-bound MMPB.  At some point, Sagebrush became Econo-Clad, and some bindings produced around the change specify both.  Recent listings credit Michael Hague as the illustrator, and say it is over 8x10 inches, so perhaps if you order one you will get a re-bound 1989 illustrated TPB... I don't know.
RRP  $30.55
ISBN:  061382735X
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Sagebrush / Econo-Clad / Tandem Library / Topeka Bindery  1999
Library Binding Edition.  The binder may be listed as the publisher, which changes over the years like the covers, but the ISBN stays the same.  Available new.
RRP $16.95 - $19.65
ISBN:  0808520806
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Paw Prints  2008
Library Bound Edition, MMPB sized, cover art not seen, but this is marketed using the image shown.  Available new,  RRP  $19.00
ISBN:  1439527261
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Turtleback   2012
School and Library Binding Edition, MMPB sized. Hobbit Movie cover, Available new,  RRP  $19.65
ISBN:  0606262407   9780606262408
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Thorndike Press  2003
Large Print Library Bound Edition.  Out of print.  RRP  $31.95
ISBN:  0786251778
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Thorndike Press  2003
Large Print Hardcover Family Edition, out of print.  RRP unknown.
ISBN:  068146576X
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Large Print Press  2003
Large Print Softcover Edition, out of print.  RRP  $13.95
ISBN:  1594130051
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Houghton Mifflin  2002
Softcover Annotated The Hobbit Teacher's Guide
This course is intended for classroom settings, and may only be available as a complete classroom package (with multiple copies of The Hobbit), if you can find it. 
ISBN:  0618168168
Graphic Novel Editions
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Eclipse Books  1989, 1990, 1990
First Edition.  Softcover, staple-bound graphic novel edition in three volumes, Illustrated by David Wenzel.  These, and all other Eclipse imprints, originated in the USA but some were marketed in Canada and the UK.  RRP $4.95 each
ISBN:  0913035807, 0913035815, 0913035823
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Eclipse  1990
Hardcover graphic novel limited edition in clamshell case, red library binding with gilt cover decoration (photos on file).  Of 1000 printed, 600 copies were numbered and signed by illustrator David Wenzel and sold in the clamshell case.  If you find it for sale it's usually in the UK. 
ISBN:  1560600683
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Eclipse  1990
Hardcover, same as above but unsigned and without a case.  It is possible that this was offered to retailers as a promotion, not for sale to the public.  There are 400 unsigned copies floating around out there, and when found for sale they are very often still in shrink wrap.  It seems unlikely that their owners realize how scarce these are.  RRP unknown.
ISBN:  1560600675
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Eclipse  1990
Large softcover, graphic novel edition, Illustrated by David Wenzel.  Out of print, RRP $12.95
ISBN:  1560600543
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First U.S. Edition,  Ballantine  1990
Large softcover, graphic novel edition, Illustrated by David Wenzel.  Out of print, RRP $12.95
ISBN:  0345368584
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Ballantine  2001
Large softcover, graphic novel edition, Illustrated by David Wenzel.  Cover art by Donato Giancola.  RRP  $17.95 - $20.00
ISBN:  0345445600
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Reprint Edition,  Ballantine  2001
Large softcover, graphic novel edition, Illustrated by David Wenzel.  New cover art, six new pages of art.  RRP $20.00 - $22.00
ISBN:  0345445600   9780345445605
Script Editions
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Dramatic Publishing Company  1968
Softcover, large cast edition, two acts.  Adapted by Patricia Gray
This title/author comes up with ISBN 9995276690 and 9996340511, no indication that it differs from this version.  The earliest date on this title is said to be 1957.  Available directly from DPC : may only be licensed or sold in the U.S.A.  RRP $6.95 - sound effects CD available for an additional $25
ISBN:  0871294273
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Dramatic Publishing Company  1972
"The Hobbit: A Musical"  Adapted by Ruth Perry, music by Allan J. Friedman, lyrics by David Rogers
Score not included.  ISBN search results may turn up brown cloth hardcovers, no indication who bound them.  Older copies have a mustard colored cover background, new ones are B/W.  Available directly from DPC : may only be licensed or sold in the U.S.A.  RRP $7.95
ISBN:  0871293935
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Dramatic Publishing Company  1977
" An Adventure Play"  Softcover, large cast edition, one act.  Adapted by Edward Mast.  Available directly from DPC : may only be licensed or sold in the U.S.A.  RRP $6.95
ISBN:  087129589X
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Dramatic Publishing Company  1992
Softcover, small cast edition, two acts.  Adapted by Markland Taylor.  Available directly from DPC : may only be licensed or sold in the U.S.A.  RRP $6.95
ISBN:  0871291746