Maybe I'm just cheap, heh, but I don't see how those are worth it. I easily make due with a couple normal wrenches in adjusting it, I mean it is only supposed to be done every 15k miles. Isn't like I'll be using them all the time or anything. I just use a normal feeler gauge that can be found at any parts store for the measurements.
If you insist, I believe the guy at:
www.**************.com sells the wrenches, or you can find them on ebay sometimes from that guy too.