Convert Character STL to STP

I have a small batch of 3D character models—no more than five STL files—that I need precisely converted to STP format. The meshes are already finalized, so the job is a straight-through conversion: no scaling, reshaping, or other edits... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Printing, AutoCAD, CAD/CAM, Solidworks)