DEAL-- Pay just $10 to Old Navy $20 voucher (In-store only)

This deal is ended. However, you still can Sign up to Groupon. 

DEAL-- Pay just $10 to Old Navy $20 voucher (In-store only)
First, Sign up or log in to Groupon here. 
Then, click here to purchase this deal. 
The deal will be expired 12:00 am June 3 2011 (June 2 midnight).
The coupon expires 7/30/2011. 
One time use in US only.