Also, I don't recall the source, but I recall a pedal attachment like the Nashbar, except it was set up for you to install a set of cleats for your favorite SPD compatible pedal (which I assume would include Crank Brothers models). Cost would be the sneaker part plus a spare set of cleats for the pair.
Heck, I couldn't help myself and just did a search...
http://www.jensonusa.com/store/produ...+Clip-Ons.aspx