Sites that tell the trustworthiness of other sites?

[Tromack]

I know there are a lot, but for some reason I'm blanking. I'm looking at buying a TV and there are quite a few sites that offer the TV's for a lot less than the bigname sites, so I was just wondering where I should go to check the trustworthiness of these sites.
Thanks.

 

[Condor_]

http://www.resellerratings.com/

this is the one I always use.

 

[Ender]

www.bbb.com