Last week I picked up a Victoria Amps 2 x 12" cabinet for $50, and a 1984 TS-9 Tube Screamer for $75. Sold the TS-9, kept the cabinet. Same guy (who was moving) GAVE me a Lexicon MPX 1, Line 6 POD, half a dozen stands, Peavey Rage amp and about 200 cables. I sold the MPX 1, picked out the cables I could use (including a 10' run of MIT Music Hose speaker cable) and donated the rest to this awesome youth group:http://yeahintheboro.org/
From the same guy I bought a Yamaha Recording Custom snare drum for $50, which I sold for $550.
Last year I bought a blue strip Urei 1176 for $1000, which I sold for $4000. Bought an engagement ring with most of the profit.
I've had a lot of good deals over the years...I didn't have a job all through college I just flipped gear.