You should list your location. Every spring and fall there is the Kutztown Antique Radio Show in Kutztown, PA. There are hundreds of the old style radio's for sale there every meet. As a bonus it keeps getting more and more stereo gear there as well. Ten's of thousands of tubes and other hard to find items as well.
Been going for a few years now. Rain or shine it's held under two large pavilions with lot's of vendors. I meet up with a few audio friends and hang out for the day.
BillWojo