I tried this myself (whole computer supply thing) about a year and a half ago and found out its not worth it in my eyes.
Any price that I could find from a wholesaler (Tech Data, Ingram Micro, etc) I could find on the net for afew bucks more. There was not enough profit to make it worth while. I bought a few things for myself, but often the newer and more popular products were back ordered.
Plus you have to deal with submiting state sales tax, another source for income tax, etc, etc...