He's not selling them anymore. The web page says until Fall, but that was Fall of last year I believe and he never started up again. You can find them occasionally here in the marketplace or on ebay. I picked up the 1/5 Z on ebay a couple months ago and there's a 1/4 scale kit for sale right now here:

[link]http://www.rcuniverse.com/market/item.cfm?itemId=449452[/link]