Trailer city cells the food grade 50 gallon for 25 each or 15 each for 4 or more. I am going to pick one up for my RODI storage, but would like a much larger, like 125g, standing tank for saltwater as i am going to have a auto water change system on my tank. Anyone know of anyplace local to buy them...i can get them on ebay but shipping is about 150 each!