Bathroom cup dispensers are available at general retail stores such as Walmart and niche stores such as Bed, Bath and Beyond. Online stores such as Amazon.com also sell bathroom cup dispensers. On BHG.com/shop, Better Homes and Gardens provides links to various styles of bathroom cup holders available on different sites.
Enter the phrase "bathroom cup dispenser" into the search field on the respective site to view purchase options. Walmart sells standalone bathroom cup dispensers, as well as cup dispensers combined with toothbrush holders in a single unit. Ebay, Amazon and Bed, Bath and Beyond bathroom cup dispensers options include standing and wall-mounted dispensers and a variety of colors, materials, sizes and brands.