They had a lot of used manuals when I was there last.
Depends on which version and how many guides you're going to start with. Each book can go anywhere from +/- $20 to $40, just depending. Hardbacks are always more expensive than paper, older books cheaper than newer. Newer manuals have changed the system of play and removed a lot of unnecessary stats while implementing a few new ones and features. Decide on what version you want and go from there. Call them to get some pricing.
And their stock changes frequently; best to stop in and have a look. I always find new games of interest when I go; it's worth the trip.
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