Plug & Paid makes it ridiculously easy to create unlimited shopping carts for your website with just a few clicks and a tiny bit of code. The tool provides live metrics and sale data and supports major payment methods. One can easily add products descriptions, dimensions, prices, photos, etc. Review collected by and hosted on G2.com.
One issue I had with the tool which is being addressed by their team is that they have implemented this as a one item per checkout so if your clients wants 5 items of the same thing, they have to check out 5 times. This makes it seem more like a "BUY" button than a shopping cart. But the team is addressing this. Review collected by and hosted on G2.com.