Ithica/Toddy uses a saucer sled as well. If you were at the last HQ event you saw it. Red, with a Medusa head and Greek lettering. He cut semi-circles out on each side to get it within regulation size, whereas I shaved the edge off almost the whole way around.
I can vouch for the durability of Wilde's shield, too.
Another material some people use is thick foam. I don't know what it's called, but it's pink, about 1-2 inches thick and very rigid. The drawback is the off-chance that somene landing on it very hard could snap it.