Coffee Grinds sometimes do fall on the floor: And what you would need is a great vacuum. I am not recommending one, but I will mention an online site where I have purchased 2 Miele vacuums as well as vacuum bags.
Where to buy: It is witbeckvacuums.com. And you can try witbeckappliances.com for, what else, applianaces. Matt Witbeck is the one I have spoken to many times and he is not only knowledgeable but a really nice person. He will do what he can to make a sale as pleasant as possible.