Crumble Co.

Been using for a few years now on CrumbleCo.com, works without flaw! Basic and affordable, and integrates with Mailchimp.

I reached out to the dev after the app refused to sync products (using the provided instructions, and waiting) and got back a snarky attitude based email. Beyond unprofessional and do not recommend. It's not user friendly and nowhere near out of the box ready.