Heh to me , hitting Goodwill is a hit and miss kind of thing. You'll see some rare games for 3.25 a piece since they have pure ignorance of a game's value. Try going like once a week.
Oh, I go every week to all of the thrift stores in the area. And when I visit friends or go on vacation, I always check out the local spots as well. I have never found any really good video game stuff. And NEVER a TG-16 item (not even a loose HuCard).
Northern NJ in the early-mid 90's
Southern CA in the late 90's -- today
both SUCK it for me! Personally, I think other folks get the stuff before me,because I've run into a bunch of "regulars" over the years and they scour the place regularly.
On a more positive note: I have found tons of other great things at thrift shops (mostly computer stuff... tons of awesome hardware and software in excellent, working condition: Laserdisc movies, Apple ][, Atari ST, Commodore 64, Vic 20, Colecovision, 2600, 5200, etc.)
TRIVIA: the best thing about Palm Springs is..... the THRIFT STORE (Salvation Army). Tons of great clothes in pristine condition, plus I got two amazingly kool vintage radios from the 40's (they still work -- original parts!)