I never found any "huge hits", but Id say, a vintage Braves and Red Sox celluloid schedule for 18.00, that I got 165 for at an antique group shop. Also, a 1973 season complete stratomatc baseball game. Ten bucks, turned into 152.00 or something.
Never really found anything great that I ended up keeping , but I LOVE going to the shops/Flea markets.