Hah! A mossberg was the first thing I thought of.
One of my options for HD is a Mossberg 500 (w/tactical upgrades) loaded with #6 birdshot. Won’t penetrate 2x drywall (protects others in the house, but will really mess someone up at close range...
Yeah, inexpensive and will get the job done. I love my Mossberg. Though I don’t have the cool pistol grip and accessories, as my wife actually prefers it stock. Whatever makes it easier for her in an emergency...