Plenty of crazy stuff I could have bought back when I started, from late 77 till 82-83.
But the ones I'd like to have back was a group of 76 Hostess that were probably proofs of some sort. Different colors, numbers over 150 on some, weird colors, reversed negatives, lots of odd ones. Traded for the batch, and gave up a 74 McCovey Washington card. Went to the local shop a couple days later and swapped about half the batch for another McCovey Washington.
I wish I knew where those are now. Not the big dollar suff, but I've never seen any others. Here's a couple I kept
Steve B