The final three titles in the HoME series
  are currently available in trade paperback (the Harper Collins International Edition), and as one volume in hardcover from HMH.
NOTICE 2006 : HMCo History of Middle-Earth hardcovers with print number lines and priced jackets have been found in PAPER covered boards.  The change likely started in late 2005, and all but the last two or three were out of print and out of stock by then, but exactly how many printings were in paper is unknown.  The point is... if cloth is wanted, it is now safer to buy in person, or order early used printings.
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The Later Silmarillion (The History of Middle-Earth Volumes 10-11)
The Peoples of Middle-Earth (The History of Middle-Earth Volume 12)  and
The Nature of Middle-Earth
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Morgoth's Ring
Houghton Mifflin Company 1993
The Later Silmarillion, volume one of two.  Hard cover, black cloth, gold lettering on spine, dust jacket.  RRP for a first printing was $24.95.   RRP $30.00
ISBN:  0395680921   ISBN-13  9780395680926
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The War of the Jewels
Houghton Mifflin Company 1994
The Later Silmarillion, volume two.  Hard cover, black cloth, gold lettering on spine, dust jacket.  Late printings are in paper covered boards;  this title did not make it into double digit printings in cloth.  RRP for a first printing was $27.95.    RRP $30.00
ISBN:  0395710413   ISBN-13  9780395710418
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The Peoples of Middle-Earth
Houghton Mifflin Company 1996
Deep dive into The Lord of the Rings indices.  Hard cover, black cloth, gold lettering on spine, dust jacket.  Late printings of this are in paper covered boards.  RRP for a first printing was $27.95.    RRP $30.00
ISBN:  0395827604   ISBN-13  9780395827604
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The History of Middle-Earth Part 3
Houghton Mifflin Harcourt 2020
Third book in a three volume set, containing the three titles listed above.  Hard cover, dust jacket.  Also available in a boxed set with the other two volumes (9780358381747). RRP $80.00
ISBN:  0358381738   ISBN-13  9780358381730
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The Nature of Middle-Earth
William Morrow 2021
Illustrated by Alan Lee.  Available new,  RRP $32.00
ISBN:  0358454603   ISBN-13  9780358454601
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The Nature of Middle-Earth
William Morrow Paperbacks 2023
Illustrated by Alan Lee.  Available for pre-order,  RRP $18.99
ISBN:  0063269600   ISBN-13  9780063269606