Went into a local thrift store earlier today and found a number of the old Mattel Electronics devices laying around their toy section. My guess is that someone got rid of their collection en masse judging how many devices were there. I just picked up three (fearing that they may not work); Football 1 (1977 copyright on back), Auto Race (1976 on back, missing the battery cover) and Battlestar Galactica Space Alert (1978, missing battery cover).Cool!
To add my own brag, I found a Football I at a church rummage sale for
$0.50 a month or two ago. And it had the battery cover, something the
one I've had since back in the '80s is missing. Works, too.