Target has SoBe Lifewater (20 oz) on sale for $1.00 each, and you’ll get a $5 gift card when you buy 10, making it a net cost of $0.50 each after gift card! That’s as low as it goes, so I’d rate it a 5.
You can use the gift card to do the deal again, effectively “rolling” it. The gift card deal is effective through Saturday, May 12th.
They’re also doing $5 gift card deal when you buy two Huggies big packs, but I did the math and it comes out to around $0.20/diaper – an OK price if you need them but not a stock-up price at all.