Do they sell some sort of case that has a clip on it?

I have an 80 GB ipod video but I need something lightweight/with flash memory for running and lifting weights. I'd rather have a nano because of the screen and storage capacity, but the shuffle is more appealing because of how light it is/the clip on the back. I don't want to have to stick a nano in my pocket or use one of those stupid armbands. Does such an accessory exist?