I bought 10 gallons of walmart 10% at 2.50 a week or two ago, and won't need any more for a while. I saw this thread at the beginning of the weekend and wrote it off thinking I didn't need anymore. But I guess at the price it can be worth it. By the time I get around to using it, it'll be near the 10% strength I've got my stenner pump timed to feed out, and it's more than 50cents cheaper per gallon with the rebate. I store all my bottles in the cold dark basement, so degradation should be a minimum.