With orders of $25 or more, Amazon offers Prime members the Coleman 27-Piece All Purpose First Aid Tin for $3.70 with free shipping. (Non-members can spend $49 or more to qualify for free shipping.) That's the lowest total price we could find by $2. This crush-resistant tin features a hinge top, embossed first aid cross for easy identification in the dark, and commonly used first aid items.

Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25 or more.