The dollar amount will be the cost of a 6 inch file.
All that has to be done is to file the end of the ejector so, rather than being square, it is slightly angled to the right (towards the ejection port.) The angle needed is not large.
If one is careful, and doesn't take a lot off at once, there is plenty of material on the ejector to experiment with angles.
This is a matter of preference-- as long as the weapon ejects, it is functioning properly.
The most this exercise could cost is the price of a new, gunsmith-installed ejector.