Groupon offers a $15 Jamba Juice eGift Card for $10. (It will be emailed to you after purchase.) That's tied with last week's mention, $5 off, and the best Jamba Juice deal we've seen from Groupon. Note that the card can't be used at airport, Safeway, Target, university or hospital locations.
Also available is a $25 Jamba Juice eGift Card for $20.