The least expensive Taylor K-2006 kit I've seen online is here. A kit in a similar spirit of Ben's kit in that it has more logical quantities of reagents and has 36% more volume of tests (so is comparably priced to the K-2006 kit above) is the TF100 from tftestkits.com here. The TF100 has somewhat different contents as described here. They are both excellent kits.
Richard
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