Let’s see…the cost of lancets has caused me to use the same lancet for months on end. Just kidding. I have a lifetime supply of those. I remember when my husband and I first moved in together and he realized I only had old lancets (like 10 years old), he bought me several boxes of lancets and guess what, those are now 10 years old. Do they expire? I’m not sure. I think he is still mortified that I don’t change it more often and I probably should be but I have more important things to worry, stress about. Like cost of test strips, insulin, health insurance, etc.