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Words of Warning
Prices of used volumes vary tremendously. SHOP AROUND.
Some books appear in several editions. PAY ATTENTION.
Distinctly different volumes may have similar or identical titles. TAKE CARE.

If a book is not available for purchase, try Interlibrary Loan Services at your public library. This service may involve fees.

I. General-purpose search engines

www.metacrawler.com
www.google.com

II. Companies which search several vendors for your book
The result may be several choices for the same book.

www.stonebooks.com Specific to World War II. Handy links to many publishers.
www.abebooks.com
www.alibris.com
www.amazon.com

III. Used-book vendors
Carry many old (and new) military titles.

www.aeroplanebooks.com
www.abebooks.com/home/PAULBOOKS Paul Gaudette Books, good selection of AAF-related titles.

IV. Publishers
Specializing in printing and reprinting books on military topics.
At times, they have the best prices due to sales and specials.

www.merriam-press.com
www.motorbooks.com
www.pictorialhistoriespublishing.com
www.schifferbooks.com/military
www.turneronline.com

I would add Half Price Books used bookstores to this list.  Their website, halfpricebooks.com has a store locator feature (with the search feature supplied by abebooks). Last time I checked, they were in only nine states, but if you're fortunate enough to live near one, you can do very well. Last week, I got a first edition Zemke's Wolf Pack (as told to/by) Roger Freeman for under $10.00. Over the years, I've found several of Freeman's books, Jablonski's books, and many, many others. They do carry overstocks, but the real treasures come in when someone sells off a personal collection. I try to check our local store at least once a week, because the types of books this group will be looking for tend to sell fast.

Reed Hammans

I'll certainly "amen" rhammans' suggestion about Half-Priced-Books, if you're looking for bargins. I've picked up quite a few there including some autographed ones.  Of course, if you're looking for something specific you may have better luck with the web-dealers.
 

Thank you very much for putting this together for us. It was no small effort, it took sometime and I for one appreciate your work. Again thank you,

Sincerely yours,
PA.Dutchman

Son of T/Sgt. Ray A. Heilman, JR.
11 TH Field Artillery 1937-1940
Schofield Barracks
7 TH AAC 11 BGH 42 Sq.1940-45
Hickam Survivor 12/7/1941
AAC Armorer (P) 911
P.U.Citation1942