I need to find out an approximate cost of developing a smart phone application to make doctor's appointment online. I have a web site with MySQL DB that stores doctors and their availabilities. The smart phone app will allow users to search doctors by zip code, show schedule (availability) of a selected doctor and provide interface to make an appt. does anyone know how much would it cost? I was thinking to use freelancer, oDesk or elance.com or an independent freelancer... any recommedation of a good developers?