Try this:
DigitalFAQ.com Marketplace
Have extra video/photo hardware or software that you would like to sell? Connect with potential buyers here. Buy, sell, trade. Individuals only, no store spammers.
I know there's at least a Beta deck for sale right now. Not yet sold.
I believe all the TBCs just sold.
A nice multi-system VCR just sold, too.
While eBay can work, I far prefer to connect with individual sellers on gear like this.
It's just too troublesome to buy used gear off eBay in recent years, so much poor-quality abused gear on there sold "as is" -- or worse, simply lied about when it came to quality descriptions. Not that I'm saying to avoid eBay entirely -- I'm not -- just be careful. My common sense test is to email the seller. Good sellers respond, crap ones do not.