app for website

i am looking for someone to design a app for my website [login to view URL] the website is nearly finished and once complete i need a app that does everything the site does BUT it must be available on apple store, blackberry and android, all platforms must be covered. i want it to work like the groupon app or the kgbdeals app so please check what my requirements are by visiting there websites ( [login to view URL] AND [login to view URL] ), people must be able to download app for free and can purchase goods just like from the website, all the design work must remain the same, logo colours etc just like on my website www.voucheroftheday.com. i need all work to be perfect and load fast along with gps location, also if there any monthly charges i need to know and how to change deals i also need to know so i can do all changes daily myself. I'm looking to spend around £300 and this is what i spent on getting the website made, its all a new business and if anyone can help me to create this i will be grateful...thanks for reading my project. someone in UK will be a great help so we can talk over the phone.