Shopping Cart for Apparel Site

I have a simple HTML/CSS website. I need to add a shopping cart to it. Here are my requirements: -Shopping cart must accept Paypal -Shopping cart must give 15% discount if 12 or more items are ordered -Shopping cart must give free shipping to any order greater than $49.99 This is where it gets a bit tricky. Shopping cart must have options available for: -Shirt Style (Options: Youth or Adult) -Shirt Color (Options: Orange on White, Orange on Black, Black on Orange) -Shirt Printing Type (Options: Over the heart or Full Chest) -Shirt Type (Options: Hoody, T-Shirt, Long Sleeve) Hoody will cost $30, T-Shirt $10, Long Sleeve $20 -Shirt Message (Open text field for customers to include a message, 12 characters) -- if the customer selects this then they are charged an additional $3.00 Last, the cart must calculate shipping. $5.00 for the first item, and $2.00 for each additional item. PLEASE MAKE SURE YOU ARE CAPABLE OF DOING THIS PROJECT BEFORE BIDDING. MY MAX BID IS $75.00.