I haven’t seen any set proof that this is by frum people… but either way, always do a BBB (or even Google) search for some out-of-the way website and see what they have to say. The better choice would be to search through Froogle, Yahoo! Shopping, etc. that usually rate merchants that fit their search results.
For cameras and stuff, though, I agree with the aboves: B&H and J&R are the ways to go! (Which, you’ll notice, are also Jewish-owned, and get amazing ratings….)