Add ecommerce functionality to a wordpress website

I need to add ecommerce functionality to a wordpress site. I'll pay $75. I need this done in the next 12 hours. I'll need to be able to do the basic stuff of product name and price. Really we there not real products selling here. Just trip packages on a about 20 pages. As for the cart I need the standard sub checkout page where they can add remove items or change quantity. And they can enter in a coupon code. In the ecommerce admin they need to be able to create these coupon codes and they will work for flat amount like $10 off or 5% off. ALL THIS is standard stuff ecommerce plugins have. This will connect to [login to view URL] I want the person to make the payment with out leaving the site. I have view cart in the bottom right corner. I want to make the smaller and somewhat transparent. Not as big a box since it just says view to cart. Doesn't need to be so big.