www.bookcloseouts.com remains one of the best sources for overstocks and remaindered golf books I have come across. They usually have 200-300 different golf books available at prices 50%-80% off list.
While most of the books are instructional, biographies or in some way about Tiger, Hogan and/or the Masters, there are some titles currently in stock that might have GCA interest:
Bernard Darwin on Golf
Golf Digest Classic American Courses
Golf, As It Was In the Beginning (M. Fay)
The World's Greatest Golf Coruses (B. Weeks)
1000 Best Courses in Britain & Ireland
Nicklaus By Design (J. Nicklaus)
Grounds For Golf (G. Shackleford)
All Courses Great and Small (J. Finegan)
Emerald Fairways and Foam-Flecked Seas (J. Finegan)
Bury Me In A Pot Bunker (P. Dye)
The Spirit of St. Andrews (Jones & Mackenzie)
Two Years in St. Andrews (G. Peper)
To The Linksland (M. Bamberger)
P.S. I have absolutely no financial interest in the website referenced above. This information is strictly for your benefit.