1st question... do you know how to paint? (If you don't, I wouldn't reccomend asking here. It's impossible to teach someone how to paint properly over the internet)
2. Online, or local body shop supply stores.
so uh you painting you kit...what color is your car? stock color? if so just go get it from your local gm dealership....duh.
if he goes to the dealership they will bend ya over with out lube
go to your local body shop supplier
can i haz bondo
I have a feeling that if you don't know where to buy automotive paint at, that you are going done the wrong road. Its really not as easy as one would think, don't waste your time and just get it done right the first time.

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alos heres a good idea...check the yellow pages for your area.