Walmart offers the Coleman 1-Gallon Jug in Red, model no. 3000000731, for $4.50. (
B&H Photo Video has it for the same with free shipping.) Opt for in-store pickup to dodge the $5.99 shipping charge. That's tied with last week's mention (although it required a $25 purchase from Amazon) and the lowest outright price we've seen. (It's the best deal today by $13.) It features a wide-mouth top with twist-on cap, flip-top spout, and bail handle.