A guy in the Albertville area has a bunch of 5-gallon (and a few 4-gallon) water containers for sale for a buck each. I bought 20 off him just today and he still has more he wants to clear out of storage (they're the older kind that don't have handles, which is why he's getting rid of them).
https://minneapolis.craigslist.org/csw/ ... 65058.html