Well with the "season" (as they say) is upon us..
lets post what you got and what a good deal it was.
Example.
Last year I was looking and found a car stereo w/ CD clarion which is a respectable brand. Didn't really need it. But they had $45 marked on it and I offered them $7 since that's what I had in my pocket, stated I don't know if it works and it's a probably discontinued. they accecpted. about a month later we got a truck for $500 in really good shape the stereo was tweeking out and what do you know I had one ready to put in it. works great.

A couple weeks ago there was a 10" pioneer sub for sale. again didn't need it but grabed it for $3 and was marked $30.. Figured I really didn't want a ton of bass in a little nissan that the king cab gets used in by the kiddies. so one is perfect.
Now last weekend I spotted two amplifiers. Marked at $10 and $15 not looking to hot full of dust and some webs. I snagged them both for a mear $2 since they looked like they may not work. well this weekend I tested them and they both worked flaulessly.
So I'll be making a sub enclosure next weekend for the little truck.

I have a ton more stories but will save em for later.. not all automotive related. LOL..
like.. the wife and i found a snowboard w/ bindings that we payed $5 for. it ended up making a great cool shelf for my sons room. used the bindings to mount to the wall and hold the "shelf" up with.