Pack of 4 Lysol Toilet Bowl Cleaner – Link 
This is currently priced at $11.96. Clip the 30% off coupon below the price and checkout via Subscribe & Save for a total of just $6.58-$7.77 w/ free shipping.
- Cleans and deodorizes
- Leaves a fresh clean scent
- Kills 99.9% of viruses and bacteria
- Proven to eliminate tough odors