Wow. This is an ambitious project and one of the first and only usefull implementation of decentralized tech I've seen. Kudos.
A small and stupid nitpick, the example shows 3 items for $650usd, seems a tad expensive for groceries XD.
This is far better than yet another useless decentralized messenger everyone wants to build. I hope it takes off.
As a more seriouse suggestion, consider offering paid hosting as a service with a price structure around traffic as I can see a lot of small stores won't have the tech experience to launch this, as easy as you have made it. Plus, they probably need to focus on importing inventory, which is probably the hardest part to get started. I could see a 'getting started inventory pack' using industry bar codes as a useful add on where they just need to adjust the price.<p>Either way, cool product.