Besides crafting mouthpieces I also offer refacing services.
The charges (including shipping) are as follows:

Hard Rubber or plastic:  $100
Brass, bronze and other metals (not including stainless steel): $150

Stainless steel (Yes I’m willing to work on it!): $200
Bite-plate changes, chamber enlargement and similar changes area little bit extra.
Please contact me to discus options for your project.