Old Navy Groupon - Pay $10 for $20 worth of merchandise

I don't usually post deals, but this one is too good to pass up. You can buy an Old Navy $20 voucher for $10 through Groupon.  I have purchased things through Groupon and it is really easy.   I missed the last one, but I have already purchased this one.

• Expires Jul 30, 2011
• Limit 1 per person. Groupon purchase may take up to 48 hours to process. Valid on purchase of $20 or more until 7/30/2011 at Old Navy Stores only.