Amazon offers the Lysol Cling Gel Toilet Bowl Cleaner 24-oz. 2-Pack in Country Scent, model no. 019200828901, for $3.76. Add it to your cart via Subscribe & Save and it falls to $3.57 with free shipping ($1.79/bottle). That's the lowest total price we could find by $5. It purportedly kills 99.9% of viruses and bacteria.
Be sure to cancel Subscribe & Save once your order ships or you'll be billed for subsequent shipments.
Lysol Cling Gel Toilet Bowl Cleaner, Country Scent, 24 Ounce, a similar product, is available at these stores