In the last 18 months or so (coming after some law enforcement agencies switched to 9mm from .40), there seems to have been a relative glut of .40 caliber service autos coming on the local used market, with 9mm autos being much less common and often having a price premium. For example, I've seen a $100 difference in similar condition HK USPs between the two calibers. Using WWB range ammo as a guide, it would take about 2,500 rounds to make up the difference in price.
Is anyone here buying .40s when you'd prefer the 9mm?