e-commerce shop build

I have a requirement for a simple (27 products) e-commerce shop build which needs to be completed within the next three weeks. This will involve working with pre-built front end (ie all html & css nearly completed) so database required and connection to shopping basket and payment. It is essential that you are available in office hours monday-friday four the next month. Please do not reply if you have a day job, are planning a holiday or only work part-time! Full brief available.