Check the sugar, halve the serving? Limit choices to those with 35g sugar per 8 ounces. And consider: Most bottles list one serving of juice as 8 ounces, but the USDA definition is just 4 ounces.
CRANBERRY JUICE: WINNER: Ocean Spray 100% Juice Cranberry Blend, $4 (four 12-ounce bottles)
Straight cran would pucker a zombie; a little sweetening is definitely needed. This gets sweetness from grape juice, but lemony-tart cran is still the star.
POMEGRANATE JUICE: WINNER: POM Wonderful, $4 (16 ounces)
Costly, but hardcore pom flavor and gorgeous garnet color capture the soul of this finicky, tannic jewel of a fruit.
POMEGRANATE ON A BUDGET: WINNER: Apple & Eve Organic, $3.75 (48 ounces)
Actually, a multi-fruit blend: Grape, apple, and pear juices lend sweetness (and help cut cost), but zippy pom flavor shines through.