I recently had a couple good finds, one was a stack of PS1 games for $1 a piece including FF Anthology, FF Tactics, and Suikoden (a first for me) and the second was an actual working Aura Interactor for $10 (I had never seen one of these in person before but always wanted one back in the day for...
Found a loose copy of Pokémon Fire Red at a thrift store hidden below a pile of random debris. Ended up getting it for $2, making it the best find I've had in a long while at that store.
If I'm not mistaken I believe that is a light gun for the Atari XE, I think it came with the console (computer) and a copy of Bug Hunt. Not a bad gun and Bug Hunt was a pretty decent Duck Hunt style game.
I have been going to a mom and pop thrift store for six months now and until today the best things I've found there have been a $1 copy of Tony Hawk Pro Skater mixed in with the CDs and a $20 sealed copy of the two Star Wars trilogies on BluRay. Today though I found a stash of decent SNES games...