I found Charmin Ultra Strong and Ultra Soft packs on clearance this morning at my Walgreens store! The large packs are marked down to $6.99. Use a $1.00 printable coupon and submit for a $2.00 Checkout 51 offer. Pay $3.99, or $0.25 per double roll. The Checkout 51 offer varies by user. Some users have the $2.00 offer; others have a $1.00 offer.
Note: Clearance varies significantly by store.