DaCocoBrova said:
instyleshoes.com
Good, hard to find sh!t for rather cheap (depending on the style). Size avail sucks though.
Uh...they charge rape prices for shoes you can find elsewhere if you look hard enough, or off eBay from legit sellers. Plus the guy who runs that site is a jerkoff.
Depends what you want, but try (and I'm not necessarily endorsing any of these):
sneakerhead.com
pickyourshoes.com
kickz.com (they're in Germany so expensive shipping but reliable)
sneaker-planet.com (japanese but have an english version)
any popular mall store such as finishline.com or footaction.com
eastbay.com
Eastbay is good for sneakers from the US. I'm not sure how into sneakers you are but if you want styles few here have and are willing to pay a little more, I'd try kickz.com and sneaker-planet. In particular Asia gets MUCH more flavor styles and colorways. Also you can give promo-shoes.com, headshoes.com or vintagekicks.com but they're resellers like instyle and you will pay grip.
Also: PLEASE beware of fakes.