Found a good place for liquid chlorine if you live in Nassau or western Suffolk. Twin County Pools located in Farmingdale (they have a website). They have a lot of commercial and residential accounts so they have a large turn over and get deliveries of fresh chlorine everyday. They sell it as 12.5% but the guy tells me it's probably more like 15% since it's coming directly from the manufacturer. A 5 gallon carboy costs $20.35 with tax or 3.75 per gal. plus tax. You need to buy a carboy (a one time expense). They sold me a used one in great shape for $12. It's not as cheap as some of the prices I've seen on this forum, but I've been looking around for a while now and this is the best deal I've found for this area.