Wordpress popularity, handy to use, customizable options and easy integration makes it more stongest CMS in the world. Holding with these features wordpress also contribute it's part in ecommerce world. It is also one of the most popular open source Shopping cart solution like Prestashop. There are only security reasons(spam reviews, hacking etc..) which could be considerd as its disadvantages otherwise it's also a best ecommerce platform for small online stores.
If you are looking for woocommerce templates then go for the official website of Woocommerce and get your desired ecommerce site!