The Cart Links block is included with eCommerce. It provides an easy way to show the number of items in a visitor's cart and also provide a link to the cart. This block could easily be added to a page or even hard-coded into a page type.
Click an area anywhere on your site and select Add Block. Choose Cart Links from the list of available blocks.
Now select the details you'd like to use and change the link text, if you desire. Each element can be adjusted.
When you're finished, click Done. Your page will now have a cart links block added to it. Here's what it might look like:
If you want to learn more abourt gettting data from the cart object, programmatically, check out this how-to.