Negative. There is no ONE do it/sell it all store. A lot of times more sophisticated stores won;t carry the cheap basics. But to name a few:
www.tadgear.com - I don't like them (personal experience) but they have great selection of stuff
www.rei.com - great selection but pricey
www.countycomm.com - they carry a wide selection of supplies, good prices but they don't get to deep into survival
I'm sure guys will recommend other stuff. This board doesn't have trade forum but other boards do. So... Check there.
I understand where you are comming from as far as asking for one superstore. Whenever I replenish my kit I always get pissed off that I have to order supplies from multiple sources which makes my shipping charges crazy.