Ah "here and there" is easier to work with. You, sir, simply need to execute some kind of arbitrage.

In college, I would buy trivets and wallpaper borders from Dollar General and sell them on EBay. If you just want money here and there, then selling physical things is not a bad racket.

Whatever you choose to sell, there must exist an uninformed market ready to buy. Turns out, this isn't hard to find.