Keyboards w/ Just the Numeric Keypad?

turpie asks: "Does anyone know if its possible to get "number pad only" keyboards, I'm thinking of using one for controlling an in-car MP3 player. I know that years ago Apple sold them for Macs, but for this project I'd be after PS/2. Then again can anybody suggest an alternative for controlling an MP3 player." I must say I've never seen such an animal before, but it does make a strange sort of sense. Has anyone sighted such a critter and can give turpie a point in the right direction?