Hi Marine- Appleton area here as well. I have seen Scheels stock HK's in the past (HK45 tacticals, P30's etc.)- not sure if they still do. Midwestern Shooters in Lomira doesn't, and don't ask--they aren't fans of "expensive plastic guns" LOL. Precision Sports in Oshkosh doesn't regularly stock them, but they are worth checking (they can order anything).
**I am a fan of Midwestern Shooters (despite their anti-HK rhetoric)--they stock the nicest Sigs and S&W wheel guns in the area.