Where can I find a resonable seat cover that fits my car with the seat belt in the backrest?

Preferably I would want black and blue. But I am desperate. The best I could find was freaking 200 bucks. Its a 2002 Chevy Trailblazer LS. A website or store please. I cant really afford to get them custom made because I am 16 and I work minimum wage as a lifeguard.