I have used this kinda thread on a local forum with mixed but mostly positive results. Feel free to add your own comment!
Yard Sale This Saturday. July 17, 2010
http://norfolk.craigslist.org/gms/1846367026.html
not sure if its a NES or SNES but since the ad says gun im leaning towards NES.
(I would go get this if I wasnt going to a flea market with a friend)
I'll update this whenever I see something here in VA that looks promising.