My favorite was RA Enterprises, but I spent many happy hours browsing at the various versions of Weird Stuff, and found they often lived up to their name.
One of the last things I bought at WSW was an HP ET 15936 "bipolar adjustable voltage clamp" for $5. Beautiful construction, even if I can't figure out how it works.
Another notable purchase was a $10 parts cabinet that turned out to have $100+ worth of Minitron displays in it.
Also, a couple of Fluke 8400A Nixie DMMs for $10 each.
An OK WSU-30M wirewrap tool for $1, just when I needed it.
A cool 1000pc Scotchlok connector kit for $5, when they were rare and exotic.
And - a very heavy box of 500 Tokin power entry filters for $25 at the bid sale. I think I still have 400 of them left
P.S. How was the April electronic flea market at Fry's?