I had seen SF 'mates at FiveBelow 2 to 3 years ago, and picked up a bunch of M.Bisons for $2.50 a pack (without the cape, and new heads, they make a neat army builder of sorts - I'll post a picture sometime of a bunch of them fighting Cap on a MegaBloks Command Ops set-up).
FiveBelow gets interesting stuff if you're willing to check it out every few weeks for new stock. I have seen 3.75" DC figures (3-packs) for cheap compared to TRU (maybe $5?). Small Lego sets can be a find as well (although not in recent memory).
This is part of the fun, right?