Which style of wheel? I've got some extras, but I would probably want to take them somewhere and get them spun up on a tire balancer to verify them before I sell them. If your timeline isn't urgent then some of these might be match.
OEM 17" rear Boxster wheels usually go for $125 - $150 each. David Porsche Parts often has some for $125, at least the last time I got a pair from him (Boxster S twist) they were $125.
I've got a few Carrera twist and a few Boxster S twist. I know one of my Boxster S twists has a small bend from the previous owner of the car who never missed a curb
But I should have 3-4 of them that are good. I am converting my Boxster back to stock and so don't need all these track wheels any more.
I would probably sell some for $150 + PP fees shipped in the US. But it might be a while before I can get to them, get the old tires dismounted, get them spun up and tested, etc...
Hybrid Mode
