Quoted from Onwallst:However I thought those kits have been out of stock for years.
They are usually out of stock, but every once in a while they're in stock for a week or so before he sells out. Interestingly, he lists all the parts in his kit on his website and he usually has all the individual components in stock. So, you could just order the parts and make your own kit. Yes, it would probably cost you $7 to do it that way, which is what I thought of doing myself.