Yeah, make your own! Also ebay i think has some on there. My cousin bought one a month ago.
But you can easily make one yourself. Just get a couple legnths of aluminum, bend them to shape, and drill some holes in them. Put a couple #6's in them and your good to go. I've done this for a client and for myself before. If you want something that wont scratch your marker or your accessory, coat with black truck bedliner.