You can buy a urinal through any plumbing supplier and Kohler has a host of them available on their website. A typical urinal uses a gallon of water per flush and that's enough of a difference in water use than that of a toilet that it would result in a noticeable savings in your water bill. A step beyond the flush urinal are the new waterless urinals that are starting to show up in commercial settings. What a brilliant idea they are, but I don't know how suited they are for household use. Something tells me that they require a lot of volume to work efficiently. If I'm wrong about that I know I'll hear about it.
Because they're new, plumbing companies like Kohler have spent a lot of time designing them and it shows. They're gorgeous, if I can use that word to describe a urinal.
So far, I have yet to convince anyone to install a home urinal but that hasn't stopped me. If you're thinking about a bath renovation and there's a man anywhere in your life, give the idea some serious thought.