Where can you buy a good reusable mop?

We are getting rid of ALL the carpet in the house we are getting ready to move in to, and we are laying down tile flooring. I am wanting to buy a new mop like a Swiffer, but will only buy one with reusable cleaning pads and a fill-it-with-your-own-cleaning-solution bottle. I know they make them because several months back I saw one on a TV commercial. However, I am having trouble finding one in any of our local stores. What exactly are they called? And which stores sell them?