Try here.
http://www.spspools-spas.com/
The Taylor K-2006 is what you want. While you're at it order extra CYA reagent. That gets used up fast. If you're going to test calcium hardness often then get more R-0010, calcium buffer too. The nice thing about Bens kit is he tweaks the quantities and also includes an OTO kit for quick chlorine and pH tests....at least the PS-233 did and thing the 234 still does.
Al