Every once in a while Swagbucks has a promotion where you can win specially designed bills and get extra Swag Bucks for winning them all.
Starting Monday, July 1st, the newest set of Swagbucks Collector's Bills celebrate different places in the world where Swagbucks is available. If you can earn all five bills (available exclusively through search) before Monday, July 8th, you'll get an automatic bonus of 20 Swag Bucks applied to your account. You can track which bills you've got by going to the "My Swag Bucks" area of your account and clicking the "Collector's Bills " tab.
Click here if you're not earning on Swagbucks yet. You earn rewards for doing all of the things online you already do, and it's completely free. I've used Swag Bucks to get MANY Amazon.com Gift Codes and you can too!