http://www.gamblersgeneralstore.com/
go to the book section, love their brick and mortar store between the strip and downtown they have huge selection of all sorts of gambling related books.
I RECCOMMEND A STOP IN FOR ANYONE WHO IS AT THE RX CONVENTION (worth the stop) not too far from downtown)
HOPE FISH WOULD AGREE HERE TOO.
Gamblersbook is a great shop too, once i was in there years ago and heard Howard (Shwartz) talk up a Celtics game to customer and it paid for my whole trip. Now years later and being more jaded i would never do such a thing but it worked.