Of the four bodies on hand, they were purchased from....
Canon EOS 501N (?).....I don't know, it's been that long.
Nikon D300.....
B&H.com
Nikon D700..... Photos4Less.com
Olympus E-P3..... OlympusUSA.com
But then you should consider this as a system thing also. There are so many ancilliary components that will creep into you Wish List. Some of the other places off the top of my head in no particular order.
Adorama and
B&H are a given (new & used).
Southeastern Camera (finally discovered they price match
Adorama and
B&H), Peace Camera and Wolf/Ritz Camera are my local camera shops.
Paul C. Buff
Gadget Infinity
Alzo Digital
Thomas Distributing
Thom Hogan
Amazon
Barnes & Nobel
Adobe
Photograhers Warehouse
TPF Marketplace
Craigs List
A couple of places in Hong Kong via
eBay
Tiger Direct
WalMart
Target
Various workshops and seminars
SmugMug, Bay Photo and the other lab
mpix
There are more, but stating where you bought you camera is a small portion of the pie.