You want the Taylor K-2006 kit. CarlD has others to recommend but they are all similar. This place
http://www.spspools-spas.com/
has the K-2006 for $49 and looks like the most shipping you'll pay is $10 for an order. While at it get extra CYA reagent and DPD powder, and reagent. Since you probably have a CYA problem you'll use what's in the kit up pretty quickly.
I'd recommend the following additions to the kit:
R-0871C reagent
R-0870i powder
R-0013E CYA reagent
The last letter is just a quantity designator.

These are all listed on page-3 in the Test Kit section.
When I ordered bulk reagents a couple years ago they came directly from Taylor and delivery was less than a week.

Al (ajs-1)

BTW: Check this thread too
http://www.poolforum.com/pf2/showthread.php?t=6340