The original shinn wave would be a bit thin on the ground although not impossible to find , ebay uk usually has some and generally cheap as chips as they are gettting on a bit now , he was playing with a concept called the piglet not sure if its in production yet, if you manage to get hold of one, ive heard if you change the strapps and pads the wave is sweet board.
I have a Shinn Wave which I've been riding for 3 years now. Can I suggest changing the footstraps to Cabrinha surf straps which are narrow and soft. They allow more freedom of your feet and put smaller fins up front to allow easier switching to toe side.
Good luck in your hunt. I still love mine.