I personally feel that the prices that sellers are asking for the Terebecki books is unreasonable, but these books are out of print.
I think a price of $15-$20, including shipping is reasonable.
The American Truck Historical Society (ATHS) does have vol 8 & 9 available for $7.50 non-member - $5.00 member each plus shipping.
These are books that I use in my research, or that I am aware of. I am not the seller of any of these books. Only providing links to help others find them.
The links will send you to a book seller site that had the book available when I created the link. The seller may not have it avaiable at this time.

Book Cover	Title	Author	LoCC# ISBN#	Source 1	Source 2	Source 3	Source 4
A-P-A Transport	Perfecting a Piece of the World A-P-A Transport	David Rounds	0-201-56794-6	Abe Books	thriftbooks	Amazon
A Duie Pyle	The First 85 Years A History of A Duie Pyle Inc 1924 - 2009	Bruce E Mowday Sarah Latta	0977420043	Abe Books	Amazon
Briggs Transportation	Life and Times of a Trucking Pioneer Memories of George Briggs	Susan Briggs Wright Barbara Briggs Root	not avaialbe	Amazon
Fallen Flags	A Coloring Book of FALLEN FLAGS of North American Trucking Companies	Sam Colyer	978-7342634-0-4	Amazon
Carolina Freight Carriers	Carolina Freight Corporation A History 1932-1985	Garland Atkins	85-063500	Amazon	eBay
Cole's Express	Connecting Maine with the Nation: 40th Anniversary of Cole's Express	Cole's Express	Free Download
Cole's Express	60 Years of Cole's Expres	Cole's Express	Free Download
Cole's Express	Allie Cole A Maine Pioneer	Galen Cole	not avaiable	Abe Books	thriftbooks
CRST	The Story of CRST	Jeffrey L Rodengen	ISBN 1-99-32022-09-0	Abe books	thriftbooks	Amazon	Amazon
ETMF	TALES OF THE ASPHALT TRAIL A Documentary History of East Texas Motor Freight 1934 to 1982	Larry Johnson	not avaiable	Abe books	thriftbooks	Amazon	Amazon
Freymiller	Freymiller Building the Truckers' Trucking Company	Don Freymiller Walter B Jenkins	ISBN- 978-0-9898883-0-1	Abe Books	Amazon
Garrett Freightlines	Images of America Garrett Freightlines	Idaho State University's "Management 4499/5599" Homors Class	978-1-4671-1665-7	Abe Books	thriftbooks	Amazon
Graves Truck Line	The Graves Truck Line Story	Judy Magnuson Lilly	1-55728-250-1	Abe books	Amazon	thriftbooks
J B Hunt	J B Hunt The Long Haul to Success	Marvin Schwartz	978-0-9859130-0-7	Amazon	thriftbooks
Lynden Transport	Everyday Heroes The Story of Lynden and Its People	Shirley Heller Raymond Ashenbrenner	ASIN ‏ : ‎ B0037V9URI	Amazon	AbeBooks
Norwalk Truck Lines	TRUCKS...TROUBLE..and TRUUMPH The Norwalk Truck Line Company	Wayne G Broehl, Jr	54-12863	Abe books	thriftbooks
Old Dominion	Helping the World Keep Promises	Jeffey L Rodengen	978-1-932022-55-1	Amazon	Abe Books	thriftbooks	eBay
Overnite Transportation	Mr. Cochran's Overnite	Estelle Sharpe Jackson	89-091073	Abe Books
Pacific Intermountaion Express PIE	Line Haul The Story of Pacific Intermountaion Express	Samuel W Taylor	58-13034	Abe Books
Roadway Express	The Roadway Story	Phillip L Cantelon and Kenneth D Durr	96-76532	Abe Books
Ruan Transport	In for the Long Haul The Life of John Ruan	William B Friedricks	ISBN: 0-8138-2531-8	Amazon	Abe Books	thriftbooks
Ryder Truck Lines	Ryder Truck Lines The First Half-Century	Richard Hagood	82-71914	Abe Books
Schneider National Carriers	Leap of Fatih The Story of Schneider	Jim H Smith	978-1-936713-03-5	Abe books	Amazon
Book I	The Vanishing Trucking Pioneers Book I	M K Terebecki	978-9991368153	Abe books	Amazon	eBay.
Book II	The Vanishing Trucking Pioneers Book II	M K Terebecki	978-096452864	Abe books	Amazon	eBay.
Book III	The Vanishing Trucking Pioneers Book III	M K Terebecki	978-0964528611	Abe books	Amazon	eBay.
Book IV	The Vanishing Trucking Pioneers Book IV	M K Terebecki	978-1125735619	Abe books	Amazon	eBay.
Book V	The Vanishing Trucking Pioneers Book V	M K Terebecki	978-0964528635	Abe books	Amazon	eBay.
Book VI	The Vanishing Trucking Pioneers Book VI	M K Terebecki	978-0964528642	Abe books	thriftbooks	eBay.
Book VII	The Vanishing Trucking Pioneers Book VII	M K Terebecki	978-0964528659	Abe books	Amazon	eBay.
Book VIII	The Vanishing Trucking Pioneers Book VIII	M K Terebecki	unknown	Abe books	Amazon	eBay.
Book IX	The Vanishing Trucking Pioneers Book IX	M K Terebecki	unknown	Abe books	Amazon	eBay.
The Ledgend of Werner Enterprises	Jeffrey L Rodengen Richard F Hubbard	0-94590394-4	thriftbooks	Amazon
Yellow Freight	Ledgends and Legacy 75th Anniversary Yellow Freight	Kent Politsch	0-9676585-0-0	thriftbooks
Yellow Freight	Yellow in Motion	James F Filgas L L Waters	not avaiable	Abe books	thriftbooks	Amazon

If you see a mistake or want me to consider adding other items to this site Contact Me