For its Prime members, Amazon offers the Plano Prolatch Stowaway 4-Pack, model no. 2-3700, for $16.73 with free shipping. (Non-members can spend over $25 for free shipping; otherwise, shipping adds $8.07.) That's the lowest total price we could find for a similar quantity elsewhere by $11. Each stowaway measures 14" x 9" x 2" and features 24 adjustable storage compartments.

Considering buying more than one? Add three to your cart for $40.19 with free shipping. That's $13.40 per 4-pack and the lowest per unit price we could find by $15.