I am just starting this thread, and it will most likely be edited over and over again.
Here to start are some resources for store platforms that are free to use, and you can do a lot with.
Some have banners etc.. if you are not paying for premium, and some do not, but all are tested and prove a good alternative for those who can not afford the premium store route in the beginning.
Some of the links below go to the same service but different stores. The purpose for this is to show you the different designs, or other things you can do with a store of website by said service.