Walmart offers the Rubbermaid Mini Ice Pack, model no. FG102610PABLU, for $1. Opt for in-store pickup to dodge the $5.99 shipping charge. That's the lowest price we could find by $3. It's reusable and fits neatly inside or snaps to the bottom of your container.
Walmart offers the Igloo 2.6-Cubic Foot Refrigerator in Black, model no. FR283I-BLACK, for $87 with free shipping. That's $7 under our December mention and the lowest total price we've seen. (It's the best deal today by $29.) It features a door basket that fits 2-liter bottles and a separate ice chamber.