Your kids are probably getting excited at the thought of all the trick or treating candy, but they are probably planning their costume, too. Costumes can get expensive with some as high as $100. That’s a lot of money for some families to spend on something your child will likely wear just once and then outgrow. But don’t worry. There are a number of great frugal Halloween ideas that will keep your kids happy without spending the money you are saving for Christmas.