man you guys get all the good stuff all my thrift stores have garbage around here and the only store that does get good games sells them pretty much at ebay prices
I go thrifting every day after work. That is the only way to get the deals...go every day, or almost every day. In the last month (from what I can remember anyway), I have gotten at least 5 Gameboy Advance SPs (usually pay around $10 each for them and sell them for almost $40 each) 3 Gameboy Advances, 5 NES games complete in the boxes with EVERYTHING (mint too), a bunch of Genesis, NES, SNES, Gameboy, and N64 games (too many to recall and list). Also got 5 copies of Windows (2 copies of Win7 and 3 of Vista - one was the Vista Product RED edition so I got more for that one). A couple copies of Microsoft Office (2007 and 2003 - sold both). A Dreamcast complete. 2 N64s complete. A gamecube complete. A modded Xbox 1. A clear, see-thru original Gameboy. 4 Gameboy colors. 1 Gameboy Pocket with matching camera. A kinect pretty-much NIB. Many GJ Joe & Ninja Turtles action figures. A complete set of Pokemon KFC special edition plushes. 14 or 15 Nintendo Wii Games. 5 Texas Instruments graphing calculators (4 TI-83+'s in 1 day, and a TI89 Titanium a week prior). 2 complete sets of Tiger Laser Tag guns with glasses (sold for $60 for each pair). A Sega Genesis 3 console (the mini Sega console). A Sega Nomad portable console. A PSOne console complete with both controllers and all cords. A PS2 slim console w/all cords and HD component AV cable. A vintage Texas Instruments Speak & Spell from 1983 complete in the box, as well as a Texas Instruments Speak & Read from 1980 in great shape. Many NERF guns & accessories - too many to count (over 20). Some Xbox 360 games. Some PS3 games. A metal detector I sold for $100 (paid $15). An Xbox 360 phat model I sold for $80 (paid $10 because they said it was RRoD'ed but it worked perfect - they probably turned it on and tested it without the AV cord in it probably...) Many HDMI cables. Seasons 1 - 11 of South Park on DVD in excellent shape. A couple seasons of Reno 911 on DVD. A couple seasons of Chapelle's Show on DVD. A stand-alone DVD duplicator tower with 4 Plextor drives in it. A Blu0Ray player with built-in WiFi. A couple 12" Sony 1200 watt sub woofers. A Magellan GPS. A like-new Kenwood car receiver. 2 sirius satellite radios with all cords. A couple cell phones. A vintage GI Joe jet. A Halo Warthog. Lots of cheap board games. A CPU/GPU liquid cooling system. A wireless video surveillance system w/2 cameras. Some Makita, DeWalt, Black & Decker, and Craftsman power tools and chargers/battery packs. Also picked up a stack of sealed Disney VHS movies still in the original shrink wrap. A 27" monitor with HDMI inputs. etc. etc. etc. The list goes on... There is more stuff, but that is all I can remember off hand. I have found a couple pretty rare PC games as well, and a vintage set of pool balls that look pretty darn old. Also got a bunch of free weights and a bar so I can work out at home instead of having to go to the gym every time.
As far as the mint, complete NES games go, I scored the 5 of them in one trip a week ago for $5/ea at the local value village (except for Hoops which I paid $3 for) - Hoops (complete, mint), Kings Quest V (complete, mint), Shadowgate (complete, mint), The Chessmaster (complete, mint), Swords and Serpents (complete, mint), and Wizardry (complete, mint). They all have all their paperwork in them, and some of the stuff is still in the original bags inside. It blew my mind how someone could take such good care of them just to donate them to the value village 25 years or so later. Crazy.
I drop a lot of money at the local thrift stores to support my eBay habit. Its a great, fun hobby and I make good money at it too so I cant complain. The hardest part is being a reseller instead of a collector, as it is hard for me to sell some of the stuff I find like the 5 mint, practically NIB complete NES games I found, and the CIB copy of N64 Zelda Ocarina of Time Collectors Edition I found recently (gold cart - complete in box with everything!).
I go thrifting every day practically though. Its one of my hobbies, it gets expensive though so I have to sell quite a bit of the stuff I buy online in order to support my habit, heh.