@wangling My unit came with 2 cups from Nebology - great for us because there are 2 of us who neb. So I ordered a 3rd one to have on hand. It cost me $129.
After a couple months, I will say we love it. Fast quiet and easy. We just returned from a 3 week trip to Europe, and with an adapter it charged quickly. And we only needed to charge it once.
Cleaning was a snap - we carried a little covered plastic container with a small bottle of Dawn and a stack of clean paper towels. Boiled when we had access to a stove every few days. Came home pretty healthy.