I would suggest making your own. Its not that hard, and it would be one off and never duplicated (unless its kick ass then expect copy cats).
I'll post up some pics of mine once they are all finished up, but here is what I created. I call them coffin boards. They are being powder coated black, then Im going to fabricate a stainless steel piece on top that will have raised holes in it for traction. If all goes well I may start doing some on the side for people, in just about any shape and size.