Walmart, Home Depot, Lowes, Ace hardware, local pool store. Beyond that anywhere you can get bleach (not Clorox) that doesn't have any additives.

Why do you say Home depot will no longer sell it? Perhaps they are just out because of everyone going crazy and buying bleach?
 
Yeah, our HD pool sections (usually outdoors) have been out for a while. Walmart is off & on with Pool Essentials. You have to catch them right when they stock it. If you use laundry bleach, also be sure it doesn't say scented or splashless.
 
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