I've never had any great pawn shop wonders, but I did pick up a Line 6 ModPro used at a music store once for $149.99. It was a year or two after line6 stopped making them, and they had gone for over $700 brand new. I still own it and it's still in pristine condition like I bought it. It came with manual and everything and couldn't have been more than a day or two out of the packaging. It's almost always in my rig at least for a chorus effect.
I also have a bass playing friend in Pittsburgh who managed to score a natural finish Warwick Thumb 5-string for $600 at a pawn shop. The owner thought it was an exorbitant price at the time I guess, and figured he made out like a bandit. Had he known more about basses, he would've understood that that bass was probably worth in the ballpark of $2,500. He played for the band Jazzam for a long time. I believe they just split up a bit ago. Who knows what they're all doing now?
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Music Gear Review - Keyboard/MIDI and Songwriting Editor/Mod
"I don't like it, and I'm sorry I ever had anything to do with it." - Erwin Schrodinger, on Quantum Physics
Keys: Nord Stage 88, Nord Lead 2, Yamaha W7
Upton Bass Custom Upright, BSX Allegro EUB, '80s Peavey T-40, MIM Active Jazz Bass, Godin BG-5, Fender Bassman 100, `68 Fender Bassman 50 head, Gallien-Krueger Fusion 550, SWR (pre-Fender) Goliath III 4x10, Markbass 2x10 Traveler