Yup, sounds like you're about at the end of what's there.
Showing your current inventory while browsing the shop seems so obvious, I'll add that in the next update. Thanks for the suggestion.
A toggle for the merchant amounts may show up in one way or another - but as the fall kind of gets fleshed out, you'll see that the economy changes a little to provide a new resource management game. The intention is that the day-to-day of running the inn will evolve to stay interesting as time passes.
Thanks for the spotting those bugs, I've written them down and I'll try to get them squased in the next update.
Thanks for playing and leaving feedback, I appreciate it a great deal.