4-11-12 Create .stl files for 3D printer

I need to have several products modeled in .stl to allow a 3D printer to create them. (Using the Makerbot Replicator) Attached is a sample product from the Sketchup 3D warehouse. I have 1 very good designer that I use, but would also like to have a 2nd freelancer to utilize if my timeline requires. If you can provide a cost estimate per item for: 1) When I can provide a .skp file as a guide. and 2) When I would only have the manufacturers product datasheets. All of the products will be healthcare related: - Wheelchairs - Exam Tables - Physical Therapy Equipment (Exercise bikes, etc) I realize this is a bit vague. I'm looking for a long-term partner to create these as needed for my projects.