I take this to full advantage.
I'd say i found over 1000$ in paint, and paint accesories and Markers. (Brushes, Rollers, Handles, Etc.)
Go behind paintshop, find some good shit.
go behind a local paint supply store, you'd be sure to find spraypaint.
Princess auto, you'd find some good shit there too.
(in the dumpster, that is)
Not all times, but most Wait untill after a sale or something.