I kind of don't splurge on anything, really. There has to be something, but I can't think of it.
I get my eyebrows waxed at a salon. It costs $7. And I get it done about once every three months. Yes, I could do it at home, but my eyebrows are feisty and it's a lot easier for me to spend the money.
I buy pretty expensive eyeliner...like $18, but those cheap drug store eyeliners NEVER stay on for me. So again, worth it. And I buy it once, maybe twice, a year.
Everything expensive that I own has been a gift.
I buy tons, and tons, and TONS of books, but they're always used and typically cost under $1, sometimes maybe $5 or $6 but that's a book I need for book club or school. I have a ton (way, way, way too many) craft/sewing/scrapbook supplies, but I get them all super cheap or free.
I wouldn't mind paying extra for nice stuff if I thought it was worth it, like I find expensive clothes WAY more appealing than cheap clothing, but I get it secondhand for almost nothing, so I'm not going to pay a lot for it if I don't have to.