take off wheels sell for about 50 to 60% of retail. It also depends if these wheels will fit other like BMW's (335i etc). If so prices will be on the high side. and if not, then they will be low. there should be a lot of people who got shorted on the 19's so that may help the price.
in the past I bought a brand new set of 18 inch e46 wheels with pilots only 200 miles for 1200.