I remember back in the day when they were the cool thing to have, my friend's dad made him a pair by attaching a piece a cut piece of PVC pipe to an old pair of skate shoes.
They were free, more comfortable than soaps, and worked better.  You should seriously consider doing that.  I don't remember how he attached them (I was in 6th grade), but if you think about it for a bit you should be able to figure it out.