If at the time of this update the book described is widely available new from retailers, it is noted in the description. Except for the release of new products, I am no longer monitoring any publisher activity.  Most of these editions are out of print. 
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Stories, Essays, Poems & Translations
Page 3 - Academic works
Beowulf :  The Monsters and the Critics
This essay is a transcript of Tolkien's Sir Israel Gollancz Memorial Lecture for the British Academy, 1936.
First published in pamphlet form in the UK, 1937.  This is a list of later limited editions. 
Folcroft Press 1972, 1985
Red buckram library binding, gold title on spine, no jacket.
A 1985 title page states that "This title has been printed in a limited edition of 100."  I do not know how many total copies were printed by this publisher.
ISBN:  0841407703
Norwood Editions 1975
Red buckram library binding, gold title on spine, no jacket.  Limited print run.
ISBN:  0883056550
Richard C. West, 1977
Green buckram library binding, silver title on spine, no jacket.  Apparently under 100 printed, all donated to midwestern libraries.
ISBN:  0849226090
Longwood Press Ltd., 1977
Paperback
ISBN:  0856720038
Arden Library 1978
Red buckram library binding, gold title on spine, no jacket.  Reportedly 150 printed.
ISBN:  0849551072
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Houghton Mifflin 1975
First U.S. edition, hardcover with dust jacket.  First printing RRP  $8.95
ISBN:  0395219701   ISBN-13:  9780395219706
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Houghton Mifflin Trade Paperback 1978
Illustrated by Pauline Baynes.  This is occasionally titled "Three Tales from the Middle Ages" by sellers because that's what the first line of print on the book cover says.  RRP  $3.95
ISBN-10:  0395264693    ISBN-13:  9780395264690
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Ballantine Paperback 1980
Illustrated by Pauline Baynes.  Approximately 30 printings in this cover.  Original RRP  $2.95
ISBN-10:  0345277600    ISBN-13:  9780345277602
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Ballantine Paperback reprint 2003
Do not ask me how these got labeled Ballantine instead of Del Rey in 2003, but such is indeed the case.  RRP  $6.99 - $7.99
ISBN-10:  0345277600    ISBN-13:  9780345277602
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Easton Press 2019
Full leather bindng, gold gilt page edges, gilt cover decoration, ribbon marker.  RRP  $99.00
PBN:  3478
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Mariner Books Trade Paperback 2021
Available new.  RRP  $16.99
ISBN-10:  0395264693    ISBN-13:  9780395264690
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Sir Gawain and the Green Knight / Pearl / Sir Orfeo
Del Rey Paperback reprint
Available new,  RRP  $7.99
ISBN-10:  0345277600    ISBN-13:  9780345277602
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The Old English Exodus
Oxford University Press, 1981
J. R. R. Tolkien (Author, Translator), Joan Turville-Petre (Editor).  Hardcover in dark blue cloth, with dust jacket.  Reportedly only 3000 printed, but I don't know where.  OUP publishes worldwide, and when you find one for sale it is often in the US, so I assume a fair number hit the US market.  RRP  $19.95
ISBN-10:  0198111770   ISBN-13:  9780198111771
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Finn and Hengest: The Fragment and the Episode
Houghton Mifflin First Edition 1983
Edited by Alan Bliss.  Brown cloth hardcover in dust jacket.  RRP  $15.95
ISBN-10:  0395331935   ISBN-13:  9780395331934
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Finn and Hengest: The Fragment and the Episode
Firebird Distributing; International Edition 1998
Edited by Alan Bliss.  Paperback.  Available new.  RRP  $9.95
ISBN-10:  0261103555   ISBN-13:  9780261103559
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The Monsters and the Critics and Other Essays
Houghton Mifflin First Edition 1984
Edited by Christopher Tolkien.  Blue cloth hardcover with dust jacket.    RRP  $15.95
ISBN-10:  0395356350   ISBN-13:  9780395356357
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Beowulf and the Critics (Medieval and Renaissance Texts & Studies Vol. 248)
Arizona Center for Medieval and Renaissance Studies (ASU), 2002
Michael D.C. Drout, Editor.  Hardcover, DJ.  This critical study presents earlier manuscript versions of "Beowulf: The Monsters and the Critics.  At least three printings.  RRP  $38.00
ISBN-10:  0866982906   ISBN-13:  9780866982900
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Beowulf and the Critics (ACMRS Revised Second Edition Vol. 402)
Arizona Center for Medieval and Renaissance Studies (ASU), 2011
Hardcover, Michael D.C. Drout, Editor.  RRP  $58.00
ISBN-10:  086698450X   ISBN-13:  9780866984508
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Beowulf and the Critics (ACMRS Revised Second Edition Vol. 402)
Arizona Center for Medieval and Renaissance Studies (ASU), 2011
Leather-bound collectors edition, RRP  $139.00
ISBN-10:  0866981845   ISBN-13:  9780866981842
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A Middle English Reader and Vocabulary
Dover Publications, Pictoral Hardcover, 2005
Tolkien's contribution to this book (A Middle English Vocabulary) was originally published as a separate volume.  Available new.  RRP  $21.95
ISBN:  0486440230   ISBN-13:  9780486440231