The econo rolls 11.5 X 50 are about $14 each with the discount. The premium combo with 2- 8 X 20 and 4- 11.5 X 20 are $27 with discount.
Therefore Econo are $28 for 100 feet @ 11.5 inches vs Premium @ $27 for 120 feet (with 40 feet @ 8 inches and 80 feet @ 11.5 inches).
FedEx is $13.