id like to help anybody trying to find certain chemicals. the way i did it, and probably many of you, was searching the websites of stores around here. (lowes, homedepot). i was getting frustrated 'cause i couldn't find them. i decided to CALL one, and they actually did have it. it took me a while before deciding to call, cause i thought the website was correct, so, even if the website says they don't have it, try calling. i hope this helps. also, eBay, 80 litmus (pH) papers for $1.09