HK seems to be really slow about producing guns lately. I'm not sure why. Maybe it's because it's election year. Maybe it's because demand for them has increased.
Keep looking and I'm sure you'll find one. The USP 45C is one of my personal favorites and is the my compact back up to my HK45.
It's a great gun for sure. Check Top Gun Supply from time to time. They have good prices when they have them and are great people to deal with.
When you finish speaking, don't forget to wipe.