What is the best place to buy Taylor K2006 reagent refills?

It has been the 1st year that I use Taylor K-2006 to test my pool myself. (Actually 1st year to own a pool.) I wonder what would be the best place to buy some refill.

What I do need is the following.
1. CYA test. I think I do need a lot of it. The original supply can barely test 10 times or even less.
2. Chlorine test. (the powder thing.) I some time test 3 times per day when I did the SLAM.
3. PH test. (not the base/acid reagent. but the ph indicator.)

thank you very much.
 
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