Amazon has for Prime Members: 6-Pack AmazonCommercial Heavy-Duty Floor Scrub Brush for $9.46. Shipping is free.
Product Description from Store
- 6-pack of heavy-duty floor scrub brushes for indoor or outdoor use
- Durable, stiff bristles that don’t stain or break down with chemical use
- Resin block body will not crack or warp over time
- Ideal for cleaning concrete, decks, siding, and other surfaces
- Easy-grip handle for comfortable use