I was able to get the 6% bleach from Walmart for $2.29 per 1.42 gallon bottle all summer ($1.60 per gallon). Does the granular chlorine have CYA in it? That would be my only concern about it. If it doesn't, I might seek some out myself, since I'm looking for a good method of getting chlorine under the stairs in my ABG pool. If you're using stabilized chlorine, you'll be having to pay more attention to your pH.
Because my pool is just 13.5k gallons, once my water is balanced I only need about 3 cups of bleach per day to keep it at a good level. Because I don't use the pucks and my liner is vinyl my pH stayed put all summer too. So it cost me about 1 large bottle of bleach per week to run my pool. I did have to add a bit more from time to time related to weather and bather load, but not too often. Seems pretty cheap to me, especially compared to some other methods.
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