Here is the news.
Forget about BestBuy or any other kind of regular shops for IT.
A new kind of "online stores" allows you to order all you need, up to 70% off.

For example, on DigitalFreeMarket.com, you can either buy a large range of products at a fixed price, or you can buy those products on Ebay !
That means, you know you can order the product you need at X$, but you still have a chance of buying it less !

And, the most interresting point: you don't have to worry ...
"to trust or not to trust" ... since the same company is responsible for the 2 stores ! :) , on its website and on its Ebay store.

I would recommend only to trust the power sellers on ebay.
ie: DFM, +1000 sells, ~99% positive vote => ..."To trust or not to trust" ...