Hi Norm,
It's an Aus site in Aus dollars ,same site I gave you the link for carby parts.,if you google what I named them on the pic they come up.
When I check today you are right the cheapest I saw was $20. Not sure what happened there but the same thing happened when I bought the LPG mower converter it doubled in price after l bought one.
There are other ways I can search for cheaper ones and let you know just don't have the time ATM.
I've machined them up before on a lathe ,1/16 thickness.
Cheers
Max.