Here are the options you have (that I am aware of, sure there are others) Note, I searched e-commerce on https://rapidweavercommunity.com and put them in order of how they showed up (so not in any particular order) except for the first 6 on the list (Cartloom and Ecwid are not on that site, and the plugin and stacks that go with them I wanted to keep near them on the list):
Cartloom - http://cartloom.com
Store Front Cartloom Stack - https://cartloom.com/rapidweaver-storefront-stack
Ecwid - http://ecwid.com
Ecwid Plugin for RW - https://rapidweavercommunity.com/addons/plugins/ecwid-online-store
Ecwid Stacks - https://rapidweavercommunity.com/addons/stacks/ecwid-stacks
Ecwid Project File for UIKit 3 - https://rapidweavercommunity.com/addons/projects/ecwid-shop-project-for-uikit3
Cart 3 - https://rapidweavercommunity.com/addons/stacks/cart-3
CartCMS - https://rapidweavercommunity.com/addons/stacks/cartcms
RapidCartPro4 - https://rapidweavercommunity.com/addons/plugins/rapidcart-pro-4
SimpleStore - https://rapidweavercommunity.com/addons/projects/simple-store
To Shoes Store (A project file that uses RapidCartPro4 & Foundry) - https://rapidweavercommunity.com/addons/projects/to-shoes-store
Stripe Checkout - https://rapidweavercommunity.com/addons/stacks/stripe-checkout
Some that did not show up, but I know are out there:
PaySnap - https://www.yabdab.com/rapidweaver/stacks/paysnap/
Again, these are the ones I know about, sure there might be more or other ways to do e-commerce in RapidWeaver. Hopefully the ones I missed will get added.
On a side note, people really should use the RapidWeaver Community Site more. I know not all of the developers list there, but it is a good place to start looking for products before asking questions.
Good luck in your hunt!!