Head over to this new page and enter Zip Code 18051 or 33990 then look under "beverages" to find a $2/1 coupon for 100% grapefruit juice.
Ocean Spray 100% grapefruit juice is on sale for $2 each at Safeway through 1/30/12!
This means you'll get free juice with coupon! Note that the ruby red juice variety is not 100% grapefruit juice, and that is what the coupon is for, so you'll only be able to get the variety that is pictured above.
(Thanks, Mashup Mom!)