Nice haul, Jennifer!
The best I ever did at a thrift store was a ratcheting crimper set up for doing F connectors. Paid about $5 for it, and have since bought some regular old crimp terminal dies for it to make it more useful. (Admittedly I don't stop at thrift stores nearly enough.)
Got a wooden crate of old tunes for $15 a few years back at a flea market; after digging through the mouse nests and cleaning the years of crud off them I found that there were a few good 6SN7s in the mix, so it was worth it for those alone.
I tend to get most of my stuff from the surplus places in CA when I venture out there for work, the TRW swap meet if I manage to time my visit correctly (I'm not counting that as it's more a dedicated electronics thing and I'm taking this thread to mean more 'general' flea markets), and evilBay, which is the bane of my credit card's existence.
-Pat