Yes. The online shop is only available if you make an upgrade from the free site. I am not sure if you can add products through the strater or pro bundle package! One thing I know for certain is if you purchase the business  bundle, you are able to build your brand and use the online store/products feature. Meaning when ever you share you site, it will appear as yourbusinessname.com instead of yourbusinessname.com/webbly.com

I hope this helped!