The cheapest you can do in the states is to either do some very hard shopping in Times Square or out on the Jersey shores where they have a mess of these discount warehouse sellers (some of whom do mail order stuff)...
Actually, I heard that Arizona has some ultra cheap discount warehouses as well but I don't know...
I bought my first digital camera in NYC back in 99' and I paid $350 for a camera that was going for about $700 every where else...
Perhaps they get their stuff out of the back of trucks, but if it's in a store and they got a business license then the warranties are going to be good...