Save yourself some money and make your own out of an old skatedeck. I just made this one last weekend and it only cost me a total of $4.47 at Home Depot and about 15 minutes of work.
I bought a 4" x 2' PVC pipe at Home Depot and two 12" x 1" pieces of wood. I took off the trucks from the skatedeck. Cut the wood in half and screwed it to the bottom of the deck at the tip and tail. This will keep you from sliding all the way off the end of the roller. Now you are ready to roll.....here are some pics. Save your self $100 and buy a skateboard from a garage sale or thrift shop. They have them there all the time.