How do I look for TV VHS recordings?

There's a number of options. Some thrift stores (at least in my area, I have no idea what it's like elsewhere) refuse to take VHS tapes as donations, and no longer sell them. I've found most of my recordings at Goodwill Outlets, but it can be very hit or miss. I haven't found anything in terms of VHS tapes in a few months.

eBay is another option, though you have to be really cautious of listings with Cartoon Network/Nickelodeon recordings. They're in really high demand right now. It's a bit hard to explain, but check the item description for keywords like "Copy of a 1st Generation Tape" or something similar. It means that the seller is making duplicates of an original tape. They are not selling the original broadcast recording, but rather, a copy transferred to another VHS tape. I've also seen eBay users take full recordings off the Internet Archive and sell them... If you have any doubts, send the eBay seller a message. If the tape has a label, be sure to check that, too. Most older tapes have some form of weathering to their tape label(fading, discoloration, etc). I haven't seen any eBay seller attempt to fake that yet, lol.

I hope this helps!!