Is there a web site that is just for AZ were you can look or list guns for sale?

http://galleryofguns.com/ is AZ based if that helps

Backpage.com  is like the craigslist of guns sorta.

yeah i would say its back page, then go to sporting equipment, its a weapon menagerie i love it

thats what i use.  so far i've gotten:

1k round xd9 w/ 2 holsters and 6 mags for $400, put another 1k through so far, no problems
surefire 6p led defender, elzetta mount, CAA pressure switch for $30 altogether, none looked used at all
traded one of my guns on there for an xd
traded another one of my xds for an lcp

all 5 of those transactions went very well, so i'm 5 for 5 with no creepy craigslist shit yet.

phoenix backpage has TONS of new stuff everyday, tucson is kinda "eh", i've found some deals, but there is only one "OMFG WOW" kind of deal once every month