Odds are that you could DIY
some wheels out of G10, Delrin,Turcite, Micarta, Aluminum
, or other. Either at home, in a friend's shop, or have someone make them for you.
As unless they're unusually complex, once the center hole is drilled, it'd simply be a matter of turning them down to the proper size & profile. So, with a pair of calipers, a drill/drill press or lathe, & some files, chisels, & sandpaper...
Or, to get them precisely made, you could pay a machine shop, or wood
shop to do it. Most of those materials are pretty easy to work
with using woodworking tools. That, or a CNC if you want to get fancy.
And aside from Googling the properties of the materials in question, in order to see what might be a viable substitute, if you don't use that which the OEM ones are made of. Either ask on here, & or, go to www.matweb.com
as it has the mechanical properties of anything you're likely to consider using, as well as those of your current
So really, they shouldn't cost you much at all. Knock on wood
PS: Speaking of wood, even certain types of impregnated wood laminates would work
. Even DIY
vacuum bagged plywood
. Where you stack layers of 3mm marine
ply together, with each piece painted with epoxy
, & the vacuum sucks the resin all of the way through the wood. Making a tough, cheap