I don't know if these are new prices or if these are sales, but I noticed yesterday they are both going for a lot less than normal at $279 and $379; over $100 off for each. I did a review of the 12 earlier this year, as did J-man, and these are good subs. They aren't bottom dwellers though, but hey, you can't complain at this price.
CSX15 Mark II - Cadence Sound Store
CSX12 Mark II - Cadence Sound Store