I'm assuming you were talking about *real* stores, not the type you'd find online, but Shocklines sounds like something you'd absolutely love:
"Your One-Stop Shop For Horror":
http://www.shocklines.com
Check it out -- you'd never even have to leave the house!
And while you're there, might I suggest that you pick up my novel, MIDNIGHT RAIN, or my audiobook, HOLY ROLLERS? ;)
I think you'd dig 'em.
J.N.
www.james-newman.com