Do you know a place for good but cheap wigs on the web?

OK , I'm doing Cindy McCain for the wax museum at my school, I'm in seventh grade.My hair is honey blonde and I need a champagne color wig.i looked online and I saw that wigs are pretty expensive! since I'm only using it once i don't want to spend lots of money on it, but still want it to look nice. Any suggestions of online sites that have cheap wigs?Thx!!=)