pooooooo

So does anyone know a good used book store where I can unload some old sci fi paperbacks? I've been going to this one really close to me, but the lady is getting irritated that I always sell and never buy. I got so nervous last time that I ended up buying this Tom Wolfe book that I did not want and will never read. I picked it out because I've heard good things about Tom Wolfe, the page I randomly turned to in the store involved a man at a craps table yelling "Hernia! Hernia!", and I was cowed by the store lady. I do not want this happening again.