Precise Vector Tracing Needed

I have a series of hand-drawn sketches that must be transformed into crisp, scalable vector files through vector tracing & redrawing. The source material is only sketches, so accuracy in line interpretation is critical... (Budget: $250 - $750 USD, Jobs: Business Card Design, Corel Draw, Graphic Design, Logo Design, Menu Design, Proofreading, Sticker Design, Vector Design, Vector Tracing, Vectorization)