Ecommerce website | Personalized Product & Pricing websites

Website 1 - Ecommerce( amazon,zappos,style.)
I am trying to find a simple website template that allows me to offer products /pricing and an image. Something similar to zappos or superbrightled.

Website 2 & 3
I'd also like the option to have 2 alternate websites with the same layout and a different domain than website 1. Website 2 & 3 will have the same domain, but the products & pricing offered will have varying pricing depending on the customer. (I'd also like to be able to keep track of the url and price offered to a customer on a specific page.)(sometimes a customer will request pricing on a quantity of 10 of product A and we will markup 25%, and sometimes the customer will request pricing on product B at a quantity of 400 and I'd like to mark this up maybe 4%.

For example Id like to offer a line of products to a specific contractor with a specified markup.

On the backend I'd like to have:

• A checkbox for product A,B,C,D and be able to select A,B,C for customer 1 and A,B,D for customer 2. Id like to be able to send them a link for this page and product pricing/offering that is specifically made for them. The ability to enter a range or scale for pricing on a product depending on quantity would be nice.

Is there a template for something like this?
Any direction would be great. I would be interested in someone else doing the work for this template, but I'd like to know what I'm working with as far as a user interface and customization is allowed without turning this into a full blown overkill website /database project.