They had over 200 sets when I bought mine in December and they had 6 left as of yesterday. I hear that the current price is about $200 shipped for the few remaining kits. This was a one-time inventory selloff of leftover NOS Thunderbolt parts. When they're gone, there won't be any more.
Bob's relaying what I found out when I called them the other day. The price is $209 shipped and you can only get them by calling Hillbank. Brianna said they did have a number of CAI kits left (I picked up one of those, exhaust, sway bars, and mirrors). The sway bars are also down to the final few. Grab them while you can!