iPhone/Android application for Sportsevent

Hello, I would like to develop an iPhone/Android ecommerce application for foods/drink/goods specifically targeting live event. Concept is quite similar to the following; [login to view URL] [login to view URL] -Ecommerce functionality -Location Support (delivery of foods/drink will be made based on GPS info) -Backend order management system We would anticipate the design execution to take place in two distinct stages: 1) Demo version – Partially working prototype 2) Fully functional and transactional product I welcome you to use open source software and create the app/system if it make sense. I would like the demo version to be developed in a very short timeframe (ideally within 1-2 weeks or less). This will be used as the cornerstone of the initial marketing phase where local deal suppliers will be approached, shown the demo product and asked to sign up to the service. Depending on the quality of the demo version and feedback received during the initial marketing phase, stage 2) deployment will take place, on a more relaxed timescale to allow perfect execution of the app development process. I would like to know your bidding price itemized by functions and phase. Best