Tabbdulla has been out there finding the Deals. This week I bought a Lot of 19 Books at auction on German pistols from WW1 & WW2. They included all 5 volumes of Jan Stills Books on Axis Pistols including Lugers, along with 3 Volumes on the Walther P-38 by Buxton, several books on Browning HPs, and a 3 volume set on Walther pistols by Stevens...
Here is an idea of what some of the Jan Still books on Axis Pistols goes for on ABE Book Exchange. Let me just say this, my cost was less than what the full set of Stills books sell for.
http://www.abebooks.com/servlet/SearchResults?sts=t&an=jan+still&y=16&x=82&kn=lugers