I think I found my go-to source ... local independent pool store, a real hole in the wall.
Box of 4 gallons HASA 12.5% liquid chlorine (disposable), $12.99. Comes out to $0.20 / oz NaClO. Not the best I've seen in this thread, but the best non-sale price I've found in California!
Box of 4 gallons HASA 12.5% liquid chlorine (disposable), $12.99. Comes out to $0.20 / oz NaClO. Not the best I've seen in this thread, but the best non-sale price I've found in California!