SBP Centerlines

I bought, and sold... a set of SBP Centerlines 2 yrs. ago and have regretted it ever since. I have an opportunity to purchase a set of SBP 15 X 5" and 15 X 8.5" w/tires for $500. Are these even available new anymore? Assuming the tires are shot to hell, is this a fair price for them? They are polished and off of a race car so I'm going to guess they're is great shape. I sold my set for a little less than $300 and they weren't polished. I'm waiting on pictures...