How to avoid a Low stock fee?

So can I sell one item like if I find a Brand new Vacuum Cleaner can I just sell that one item on the app and not sell any more units of that item without getting a “low stock fee” or do you have to keep having multiple units of that item? Like I don’t wanna find one item, sell it then get fined because I don’t have anymore units of that item? How can I avoid that ?