DC-based Living Social is offering another major deal. (Astrid Riecken/For The Washington Post)

Update, Sept. 14: Living Social sold out of the deal, capping out at 1 million offers purchased. It was the company’s fastest-selling offer in history, according to Living Social spokesman Andrew Weinstein. He also said that, at its peak, the deal saw sales of more than 80 vouchers per second.

Original post: Living Social’s done it again, offering a half-off coupon to its subscribers — this time for $20 worth of goods at Whole Foods markets. And people are jumping on the deal.

“Thus far, more than 522,000 vouchers have been sold, and we’re currently selling more than 115k per hour, or more than 30 per second,” said Living Social spokesman Andrew Weinstein.

Five percent of the sale price from each deal goes to the Whole Kids Foundation, a nonprofit organization the grocery chain started to help schools improve nutrition.

Those interested in the charity can go to its Facebook page to vote on how the cash raised by the deal should be spent — on a teacher nutrition education program, school garden grants or an initiative to put salad bars in schools.

The deal is another high-profile marketing push for the D.C.-based daily deals site, which is aiming to catch up to industry-leader Groupon and keep ahead of new entrants into the space such as Google.

Living Social made a splash in January with its sale of a $20 gift card from Amazon for $10. The offer was snagged by one million subscribers.

(Living Social’s chief executive and co-founder Tim O'Shaughnessy is the son-in-law of Post Co. chairman Donald E. Graham.)

Related stories:

More technology coverage from The Post

Yelp scaling back Deals staff

Facebook ends Deals in a move that bolsters Groupon’s lead