I have found some blades that can easily be modified for Ice Buggy use. The blades are nordic skates that use a cross country ski binding. Not only do they work for kite skating, but the blades would work with simple modification for the buggy. The blades come in several styles and lenghts they have a flat aluminum or wood deck that would be simple to make a block that would take the axles and allow them to fit a buggy. I purchased a pair to use as kite skates and now that I have them in hand I'm working on a design to use them on my buggy. They cost between $50.00 - $90.00 a pair and are available from 14"-21" long. They could be shortened with a saw.
Take a look at www.nordicskater.com