FYI 95% of the sneaker sites people ask about on Answers turn out to be Chinese counterfeit sites, watch out...doing a domain name whois lookup more often than not exposes Chinese ownership.
http://www.networksolutions.com/whois/in...
Here's the official Nike authorized store finder
http://www.nike.com/us/en_us/sl/store-lo...
Here are some large respected shoe sites:
Zappos.com (has free shipping and return shipping) did have some bad publicity after their customer database was hacked.
6pm.com ( Zappos owned clearance store)
Onlineshoes.com
Shoebuy.com
Shoemetro.com
eastbay.com (shares facilities with Footlocker)
factory413.com a small trendy California store used by celebrities
There are forums that are dedicated to sneakers, which can be educational.
http://solecollector.com/forums/
http://www.sneakerfreaker.com/forum/
http://niketalk.com
Payless is a shoe store, try them.
I live in a small town, so buying elites at stores isn't usually and option, but a lot of websites over charge for them.