I don't really search stuff out any more. Not too interested in vintage receivers. I don't have time or the inclination to do repairs. I have been picking up some really nice speakers lately for next to nothing. Also, some great A/V receivers are starting to come through the thrifts. Like I said, I don't really collect these days, but if a pair of Athena Technology or M-Audio speakers pop up for 10 or 15 bucks, I grab them. That's fun to me. Spending a boatload on a nice vintage piece isn't any fun for me these days. I have my good gear and a few rare pieces, so I'm good.
Of course, as happened to me back in the early days in this hobby, I now have as many sets of speakers sitting on the floor as I have on the stands and shelves. I'm mainly grabbing smaller ones, so they don't take up as much room. I got smarter over the years.
I think the days of ever finding really great stuff like we used to is over. I know guys still find them, but they were everywhere 15-20 years ago. I picked up 7 or 8 R2R decks from a thrift one time for like 30 bucks. I found my TD-124 in a junk shop for 25 bucks. I remember I had to run across town to borrow 15 bucks from a buddy. Still have the Thorens and the buddy. Those were the days. It was a given you would come home with something. Ar-Xa's, TD-145's, 70's Sansui's, L-100's, HK turntables or receivers. Lots of stuff was, if not common, not uncommon.
Those days are over. Ebay and Craigslist ruined it, at least as far as collecting local goes.