It's very fun to read your annual reviews. This one was especially interesting now you've got a hardware product. It sounds like you already have figured out a

It's very fun to read your annual reviews. This one was especially interesting now you've got a hardware product. It sounds like you already have figured out a lot about dealing with inventory, but if you haven't already, you might be interested in reading up on operations management, or watching some youtube videos/lectures about it (e.g. Q,R inventory model vs Newsvendor model).