Best FREE wordpress ecommerce theme for BEST CONVERSION?

I am just testing something out in a dropshipping business, and I am looking for ecommerce wordpress theme that will have best (very good) conversion. I will be selling all kind of accessories, so general store with a shop on homepage and not much more.

Important: I am looking for a FREE theme. I know few good ones that you need to pay for, but for now I am just testing one method and dont want to invest more then a few dollars. If that works of course I will buy one.

But for now are there any good themes out there (with a demo content), that are free and will convert well?

To anybody who suggest me best theme that I like, I will reveal what kind of method I am testing at the moment.

Thanks in advance.

anybody?

Woocommerce has free very basic themes that can do all the e-commerce processing.
Further than that, I wouldn't do it on any free wp theme.