They're all over Amazon and probably Home Depot and other stores as well. The only brand I've ever purchased was YellowTop. They were advertised on some home shopping thing (QVC maybe?) 20 or so years ago. We got 2 brooms and the hand brush all still going strong. The one we use outside probably needs to be replaced because it gets used on concrete a lot. We like this brand because of the flat squeege blade on one side.

The quality of their product was good 20 years ago and I'm guessing it still is since they're still around.