$30 well spent.
Sorry I'm not sorry.
You got a Financial Accounting textbook for $30? Score! :-)
Slightly serious question: is there a used market for pet costumes?
Haha good question. I'd buy one used if I could, and it's fun to have new costumes every few years. Unfortunately it's raining in Chicago today, so I think my plans to sit outside our apartment building & give out candy are getting scrapped, so the Wooly Mammoth costume will have to wait until next year. :(