Old Navy 20$ groupon for 10$.
Once your signed in open this link in a new tab
If you have a discover card get an additional 15% cashback. Log into Discovercard.com click "shop retailers" select "g" and select groupon. (must eventually pay with discover)
Or if you want air miles. Click on links, enter miles numbers, click on groupon links and get forwarded to groupon website.
Hawaiian. 8 mile/$.
Delta 12 mile/$
United 6 miles/$
US Airways 8 miles/$