DG Home Premium Soft Bath Tissue 32 Double Rolls
, $8.95 (Reg. $10)
, sold-out online
2-Ply Sheets (very similar to Charmin Essential Soft or Angel Soft)
938.6 sq.foot = $0.0095/sqft
264 Sheets Per Roll = 8448 sheets = $0.001059/sheet
Can be made additionally slick if you already have the $3 off $15 survey coupon
that prints out at the register.
Price comparison list
from TofuVic puts this near the top.