Dakine made "Aero Racks" that were like what TR shows and they work great on towers for a surfboard rack and are under $50. J-Rack (
http://j-rack.com/) has a similar design to hold a wakeboard for $80 and has just started advertising in our market. Cool idea! These style racks are not the fastest to get a board in and out of, but if you dont do that very much and just need to store a board to two on your tower they work well.
I recently heard a rumor Monster Tower would be shipping a chrome plated surfboard rack at the same price as the wakeboard racks by November 1st