Pricing used tires & wheels?

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I've got a set of 17" tires and wheels from my previous car that I need to sell. I can sell them either as a set, or the wheels by themselves (the tires will fit on my new car.)

I've googled a bunch to try and find used ones without much luck. They probably only have 10k miles on them, no scratches and in good shape overall. How do I figure out how much they're worth?