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Dara you can do that by a number of ways. For example using the PayPal carts offered in the e-commerce widgets, by employing the PayPal options directly from the PayPal site or by using a shopping system which is free for a limited number of products (less than100) specifically ecwid.com
You can use PayPal or any number of gateways for your transactions. There will of course be a transaction commission paid to PayPal for each sale but that will be accounted for in your PayPal Account.
Yola will release a specific e-commerce system in the near future but as yet there are no details given. I don't know if that would be free or not. The options mentioned above are free.