Today only (as far as I know), Groupon is offering this $10 Starbucks eGift for only $5 – they’ve already sold over 100,000 of these!  Limit one per person; expires December 31, 2014.

A Starbucks Card eGift is a digital gift card that can be used towards any purchase at your local Starbucks coffeehouse or Teavana store. Treat yourself, or you and a friend to your favorite drink. Use it all at once or across multiple visits in participating stores.