> 
> If I can't get them, they're not available.

Exactly, if even one person can't get it, it's not fully available to
the public....
 
> Because doing the mod takes $1.50 in parts does not mean you can get the mod
> done for $1.50.  The price you will pay to modify your system doesn't only
> depend on the price of the parts; it depends on what the market can bear.

Labor costs....
 
Zeros....