JooCommerce is the best shopping cart for Joomla!
Powerful, beautiful and simple to use.
Supports PayPal, Stripe and offline payments. Digital downloads, handles variations and varying prices based on variations combinations. Multilanguage, handles stock support, discounts, taxes and shipping options.
All in a very simple way, and it's open source so you can change anything you want.
The Prism template, made for JooCommerce, is included in the purchase along with a detailed user guide PDF.