It sounded like it was $580 through unauthorized channels, and an authorized service technician would probably get them at cost.
The fact that the GP was able to find and substitute an equivalent part for cheaper means that the $580 had to be including the price of Something Else, and the fact that it was for sale in two different places means it wasn't just Miele.
Why would an unauthorized channel exist if it was more expensive than the authorized one? If I want a part for my Maytag dryer I just buy it. What kind of cockamamie scheme are they trying to pull by not selling parts?
The fact that the GP was able to find and substitute an equivalent part for cheaper means that the $580 had to be including the price of Something Else, and the fact that it was for sale in two different places means it wasn't just Miele.