Bike stand built from 1x4, 2x4 and 2x6 construction lumber designed to fit a Workmate. Cost - since I had scrap lumber, about a dollar for a couple of carriage bolts and wing nuts. Took longer to document in SketchUp than to build, but it was good practice for using SketchUp. One advantage of this design is it can be broken down and hung from a nail in the garage for storage.
Don't have a Workmate. Check out http://bluecollarmtb.com/2005/03/02/bike-repair-stand-blue-collar-style/