To be honest, this post is not going to share a list of WordPress photography themes with a shopping cart.
Because WordPress themes should not include shopping cart functionality.
Features like that belong in plugins.
In fact, we like to say that "features" are what define plugins. Meaning, your theme should control your site's design. But plugins should control what your site does, from social sharing to selling photography.
So as you browse for WordPress photography themes, be sure to look at what is driving their ecommerce functions.
At Imagely, and even at Photocrati, our plugin NextGEN Gallery drives the gallery functionality, and NextGEN Pro drives the shopping cart functions.
With that said, we recommend checking out these themes for your photography website