Anyone know the best Wordpress shopping carts?

I have a customer that wants to integrate this but I have never used any with Wordpress before.

I have used the free eShop plugin on some of my clients sites.

It does have a learning curve but has been working quite well and is customizable.

I can suggest yo one. PHPurchase is a simple WordPress eCommerce shopping cart plugin for selling digital and physical products on a WP store site.

Wordpress has lots of free plugins. Just use google to find them.