JR 40 series transmitter
It is against FCC regulations to change the frequency of a transmitter except when performed by an authorized service center. This is true for all brands, with the only exception being systhesized systems. It would be the price of the crystal and a unit or 2 of labor for a crystal change only, which each unit of labor is $7.50, plus shipping. If any other parts or labor is required it would be higher than this.