I'm sorry. But I can't get over the focus on money here. Petty is one thing, but to know how much something cost down to the cent and then work out the percentage difference and then discussions of regifting? I'm sorry but Kris Kringle or not how about just being grateful? I mean I certainly don't look at a present I've given my bestie and compare it with what I received. I don't understand this. It's about the giving not the receiving. TBH I think the universe is trying to show you something here.

I have to say I agree with this. I am really so surprised at the responses in this thread!
You have no idea why they didn't spend the $15 - maybe they couldn't afford to, or may be she just forgot and grabbed something on the way, maybe they went to buy it at the end of a long day with a screaming baby and had to get home to make dinner... Whatever.
Yes, there was a $ value assigned to gifts, yes, they *may* have not spent as much or been a thoughtful, maybe, they let another child choose the gift! Any way it goes though, it is a gift, and your attitude is really poor in my opinion.