Free website builder WITH shopping cart?

So I’m trying to make a website that has a shopping cart and drop down options. This is what I have so far http://thedelinkquentdoll.weebly.com/
The problem is that I want to to make a drop down option so they can choose the size of doll. For $20 you can get a doll size of 15 cm to 20 cm but with the web creator I’m using I would have to put an option for each size. I was wondering if there is an easier website builder that can provide this option and is free. Thanks!