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 Rubbermaid 12-Cubic Foot Large Deck Box with Seat in Brown/Gray, model no. 5F22, for $91.88 with free shipping. (Amazon andHome Depot have it for the same.) That's tied with our mention from September and the lowest total price we could find now by $38. It features a flat surface top to seat two adults, double-walled construction, and weather-resistant design.