Amazon offers Prime members the Learning Resources Pretend and Play Supermarket Set, model no. LER2646, for $11.64 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $6.50.) That's the lowest total price we could find by $11. This set includes a shopping basket, groceries, play money, sale signs, apron with name tag, and other accessories.

Update: The price has increased to $11.84.