Just got these online from a douche bag Ebay seller.....avoid ACJracing HOWEVER!!! he does have good prices on these shocks. I got this set that has rebound adjustment for $675 delivered to the door. So far I am very happy with them, they are easy to install, easy to adjust and have improved the quality of the ride ten fold!!! There is still some minor adjustments that I have to make but these shocks absorb repeated sharp hits and whoops very well.
eBay Motors: YAMAHA YFZ450, RAPTOR 660,700 WORKS FRONT SHOCKS Z (item 140276598504 end time Nov-12-08 13:55:09 PST)
This is the item I purchased and it has ended for now but the seller will post them again. Or you can inquire about a purchase from him. He is EXTREMELY slow to answer questions and slow to ship so expect that if you purchase from this seller but all in all.....it's a pretty good deal.
Hope this helps,