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So are there stockbooks or the like devoted to these unique types of stamps? Or would I have to get the binders?
Well, as far as I know stock books are limited to pages for stamps only.
You could also buy Vario (a good brand name) plastic pages for 3-ring binders. They come in various sizes of pockets on a page and work well for stamps, multiples of stamps, souvenir sheets and also FDCs (first day covers) and other assorted bits and pieces. They come in packages of 5 pages.

Link to an
ebay sale on these:
http://cgi.ebay.com/Vario-S-Sheets-...ip_W0QQitemZ310178560634QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4838153a7a
First Day Covers also have their own little albums, just search for FDC albums.
Yes there is a market for used books / binders / albums. Depends on the condition it is in as to how much people will pay for it. Shipping is a consideration also. Not a fast seller so keep that is mind too.