Amazon has Angel Soft Bath Tissue, 36 Mega Rolls Toilet Paper for $21.93. Check out with S&S and final cost will be $20.83 or $18.64 w/ 5+ S&S. This works out to as low as ~$0.13/regular roll as these are quadruple rolls.
Note: TofuVic rates this as his 8th favorite TP out of 10, however this beats his best listed Angel Soft price w/ the 15% off S&S coming in at $0.00098064/sheet.
Note2: Somebody confirm my maths. I don’t like referencing the Lord of Toilet Paper without peer reviews…