Two that come to mind :

1) I was talking to a co-worker about ten years ago about video games, and he mentioned that he has a copy of "Final Fantasy 3" on the SNES. He just offered to give it to me with the manual. Got it for nothing, which was a huge deal for me at the time.

2) I was staying at my mom's place a couple years ago watching the dogs while they were away. I noticed a sealed greatest hits copy of "Final Fantasy 7" sitting in a pile of CD's in their computer cabinet. When I asked about it, she told me it was my step-father's copy, and she gave it to me as he'd probably forgot he even had it.

I'm sure I have more good deals to share, but these two come to mind for me.