Pharmacy shopping cart site

Pharmacy shopping site. Will start out mainly for prescriptions and will add extra categories and products over time. Prescriptions will require membership and login and password entry. It will need secure storage of information as it is confidential and personal. Previous scripts and account activity will need to come up when the person's login details are entered. They will then have the option to click on a repeat item or to type in the new product. The search facility needs to bring up options once the person begins to type. It needs to be predictive and there will be a large range of alternatives. There will be options for generic or full price medication and pension and full price rates. It will need to add up the amount and once they reach the government threshold, will receive medication at a discount or free price. There needs to be a place for coupons and specials and a place to input coupon codes to take advantage of specials or deals. It needs a postcode check for delivery and postage options. There will be a small retail section starting out with mainly weight loss products, vitamins and other high demand items. Site needs to be built in Wordpress as I need to be able to add categories and products with time. If site can be completed (even just the prescription part) by 28/05/11 it would be fantastic. When you quote please give me some examples of your work on similar sites, wordpress experience and how long the project will take.