These titles have remained in print consistently, in some format or another, since they were first published. 
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The History of The Lord of the Rings
The History of Middle-Earth Volumes 6-9
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The Return of the Shadow  1988
Hard cover, black cloth, gold lettering on spine, dust jacket art by Alan Lee.  RRP for a first printing was $19.95.   RRP $30.00
ISBN:  0395498635   ISBN-13  9780395498637
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The Treason of Isengard  1989
Hard cover, black cloth, gold lettering on spine, dust jacket art by Alan Lee.  RRP for a first printing was $19.95.   RRP $30.00
ISBN:  0395515629   ISBN-13  9780395515624
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The War of the Ring  1990
Hard cover, black cloth, gold lettering on spine, dust jacket art by Alan Lee.  RRP for a first printing was $21.95.   RRP $30.00
ISBN:  039556008X   ISBN-13  9780395560082
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Sauron Defeated  1992
Hard cover, black cloth, gold lettering on spine, dust jacket art by Alan Lee.  RRP for a first printing was $22.95.   RRP $30.00
ISBN:  0395606497   ISBN-13  9780395606490
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The History of Middle-Earth Part 2
Houghton Mifflin Harcourt 2020
Second book in the three volume set, containing the complete history of The Lord of the rings.   Hard cover, dust jacket.  Also available in a boxed set with the other two volumes (9780358381747).
RRP $80.00
ISBN:  035838172X   ISBN-13  9780358381723
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The History of The Lord of the Rings Volumes 1-4 Boxed Set  2000
Houghton Mifflin Trade Paperback, cover art by Alan Lee.  RRP $50.00
ISBN:  0618083553   ISBN-13  9780618083558
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The History of The Lord of the Rings  
Easton Press fine leather binding edition.  All four volumes, thus far sold only as a set, so far as I know.  Currently back in print.  RRP $396
PBN:  2417
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The Return of the Shadow  2000
Houghton Mifflin Trade Paperback, cover art by Alan Lee.  Available new,  RRP $14.00 - $16.99
ISBN:  061808357X   ISBN-13  9780618083572
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The Treason of Isengard  2000
Houghton Mifflin Trade Paperback, cover art by Alan Lee.  Available new,  RRP $14.00 - $16.99
ISBN:  0618083588   ISBN-13  9780618083589
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The War of the Ring  2000
Houghton Mifflin Trade Paperback, cover art by Alan Lee.  Available new,  RRP $14.00 - $16.99
ISBN:  0618083596   ISBN-13  9780618083596
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The End of the Third Age (Sauron Defeated)  2000
Houghton Mifflin Trade Paperback, cover art by Alan Lee.  Available new,  RRP $12.00
ISBN:  0618083561   ISBN-13  9780618083565