Hey... I'm from the West coast and I have not found the polyquat 60% that is spoken of on this forum, however, I have been able to find something called Super Algae Kill 40% (which is the exact same ingredients as the Polyquat 60%) but with 20% less of the active ingredients.

I have found this product at Walmart made by the brand of pool supplies they carry called Pool Care.

Have a look for it.
I think I paid $17 for a litre (quart).

Dave