The truth is that when it comes to buying, most of us are trained to go for the least expensive option. The idea of saving money and getting more for less is so ingrained that we forget to turn off that internal dialog when it comes to making a really important purchase.
Buying a first aid kit is one of those really important purchases and price is not the most important criteria when choosing it. After all, you will be depending on that first aid kit in the event of an emergency. If you choose a cheap medical first aid kit, you may only learn when it is too late, that the kit you bought is costing you in ways you never thought of before.