Groupon has a $20 credit at Barnes & Noble deal up for $10 starting today at 1pm PST. The Groupon is good for $20 on online and offline purchases, including any purchases made via an ebook.

Groupon must be purchased through Monday, February 6, 2011. Expires April 10, 2011. Limit 1/person. Valid at all Barnes & Noble locations and online. Not valid with other offers or discounts.