1978 Plymouth Volare

i was planning on taking them off and keeping them for sure, they won't be going to the scrap. I have a buddy that was interested in them but if he falls through you're next in line. What would you be willing to pay for them? All 4 trim rings are there and in good shape but don't have any of the center caps. the wheels will need sandblasting and paint but that's not really a big deal. Anything else?