A few weeks ago I found a set of Bike Master risers for $36, brand new at Barney's in St. Pete. They're "stackable", meaning they go from 1', 1 1/4" and 1 1/2". They go straight back (no pivoting like the Rox). So far I really like them!
A plus is that they move the mirrors out so I now have no problem seeing what's behind me!