I have Centra 7x15 et 23's. The Centras are probably the most 'available' of 15's, though I do also see ARC's on ebay from time to time. The genuine Fuchs are super rare and usually priced accordingly. Centras, ARC's and others you will see anything from $1200 to $2000 for sets of 4. I paid I think about euro 125 for a single Centra (needed to complete my set) in a cosmetically poor state. All 4 have now been ultrasonically stripped, and I will do some painting when I'm really bored (you know, after completing the 107's rust repairs, the W140's paintwork, trusty rusty's reassembly etc etc.