Groupon: Donate $15 to Greenpeace, get $15 in Groupon Bucks.

Groupon has been running some interesting offers lately, like this one, which allows you to donate to a nonprofit AND get something for yourself. When you donate $15 to Greenpeace through today's deal, you'll get $15 in Groupon Bucks back! Or rather, the first 6,667 will (says the fine print). The Groupon Bucks won't be available till April 15, so you have to have a little patience on this one, but think of the karma! And the whales!

Here's what Groupon says about why they're doing this: "While Groupon would love to match contributions for this campaign, we can’t because Greenpeace does not accept corporate donations of any kind, we’re counting on you to donate twice as much to make up the difference."