"The common ones are $150?
What does the un-common look like?"

Read past posts on the subject. A stack each exist of two colors but only a few chips of all the others.

I was offered them at $450. I declined. I bought two elsewhere (one common, one better) for $150 each.

Tell him to put them on ebay. Maybe I will bid, maybe I wont. I wouldnt start them too high if I were you though wouldnt want to waste those ebay fees