Amazon has 3-Count Scrubbing Bubbles Continuous Clean Drop-Ins Toilet Cleaner Tablets for $3.88. Add 2 to cart for $7.76 – $1.94 multi-buy discount – 5% when you checkout via Subscribe & Save = $5.43. Shipping is free w/ Prime or on $25+ or $35+ orders (minimum requirement varies by location).
Product Description from Store
- Scrubbing Bubbles Drop-Ins are just the remedy for yucky toilet stains
- Just drop a tablet into your tank to help keep your toilet bowl stain-free up to 4 weeks
- With every flush, your toilet enjoys glorious relief from stains caused by hard water, minerals and limescale
- Hassle-free stain and smell protection that drops right in your tank for a continuous clean
- Bowl water not harmful to children or pets, however, it is not recommended that pets regularly drink water from toilet