Replying to How much for those ON3Ps ?

Yo guys, my friend's dad would like to sell his old pair of On3p and he asked me how much he should charge for them.

I hadn't the possibility to see them in person so I tried to search on google the model to spot the value/price range, but I didn't succeed.

Have you guys any ideas? How much money (not considering ski conditions) would you pay for them?

p.s. they're sick af