You'll find them for sale all the time on pirate, but the prices usually aren't much cheaper than new. If you're not doing production work, the dies will last you a lifetime.
I've seen threads on pirate where guys made them out of wood. They obviously don't last nearly as long, but hell..........it's wood;D. You should really look for 1 3/4" as well as the other diameter ones. The 1 3/4" die will pay itself off in no time with a couple of bumpers you fab for your friends.