I haven't done a price comparrison lately, but I got mine new off ebay last year for under $300 shipped. Mine are under-powered using a KX700.5, but I think Kicker recommends their ZX450.2 or ZX 350.2.
I got mine off cartronix or something for 169. I knew they likely would not be warrantied, but since the authorized dealers wanted near 300, I figured I could buy another pair if anything went wrong and only be a few bucks behind.
I looked at many online stored not on ebay and they all had horrible reviews. The ebay stores had better reviews. I went with a place called The Audio Club, I think for $240.
-Manufacturers warranty vs store warranty -New vs refurb