I always tell clients that if they can't afford the basic package by Shopify, you are not ready for eCommerce.

Free carts are great unless your time is valuable.

If you only have 10 products and you simply want to test the waters, you can certainly take a look at building add to cart buttons using Paypal. Another alternative is to use Squarespace.com which is only $20/month.

I've used Shopify, Bigcommerce, Magento community/Enterprise and many others for my own eCommerce business. Start small. You don't need a very expensive cart to sell online. You just need to know your exact needs.

Let me know if that helps or if you have other questions.

Cheers!

Alaa