Know where to get an Avenue Q sweatshirt?

Okay so i saw avenue Q on thursday & i abosuletly love it! and i really wanted a hooded sweatshirt that said avenue Q or something cute on it from the show (not something on it thats inappropriate, cause id wanna wear it to school) & whenever i look online for discounted ones there all so expensive. so if you can tell me where i might be able to find one for less then $20 thatd me great! thanks so much in advance =)