I picked up a Mortal Kombat Tournament Edition 360 fight stick pack at Best Buy a couple weeks ago on clearance for $60, marked down from $150. It included a new copy of MK and some DLC, which I already owned, so I sold that stuff on eBay for $40. $20 for the stick!
Also found some family's old NES system in a beat-up Snyder's pretzels box at Goodwill last year. The box was Saran wrapped big time to prevent water damage I guess. Inside I found CIB copies of Burgertime, Play Action Football, All-Pro Basketball, Bible Adventures, and Big Bird's Hide & Speak, an NES console, 4 original controllers, an NES Satellite, all the console's paperwork, and even the original 1989 receipt for the thing! Everything works great and is in really good condition. Goodwill charged me $15 for all of it. That was a nice day