As for the first aid kit, I bought the store's own brand, and not the name-brand one, because it was a few dollars cheaper. Only, again, it wasn't, because it wasn't eligible, even though pretty much every first aid kit appears to be eligible.
I promptly returned the two items, because I'm stubborn, and cheap, and trudged to work, knowing I had $23 left to spend. I'd be damned if I didn't spend that $23.
On my lunch break, I went to [anonymous major drug store], because it's next to my office. I bought four rolls of medical tape. Eyedrops for my surgically repaired eyes? Not cool. Tape I'll use for playing soccer? Totally cool.
The hallmark of someone with money is not giving a shit how much something costs. The hallmark of the poor is buying what's cheapest and often paying more in the long run (think cheaply made shoes). Being a spendthrift led to me saving a few dollars -- but wasting a colossal amount of time. As that saying goes, time is money. I'm a $100 moron.