A very cost effective solution is the java based shopping cart solution. Theres a one page frameless (two pages including the checkout page) version available, just duplicate the product page as many times as you have floors in your online warehouse and add your products. Setup instructions are embedded in the page html code.
MultiCards Javabased shopping cart - one page/frameless
The framed version is a bit more complex and is basically four pages, is more versatile but needs a bit of programming skill and html knowledge for the setup. You are free to copy them below, however if you want us to send you a complete zipped setup for your account, we will charge a nominal fee of $35.