Once you've collected enough SB, you can redeem them for gift cards to stores like Walmart, Target, and many more! I like to use mine for PayPal.
Here's all the information for this week's Valentine's Day Collector's Bills:
Search the web through the Swagbucks search starting Monday, February 6th through Friday, February 10th, and when you get a search win, you may get a special Collector’s Bill valued at either:
When you get a Collector’s Bill you’ll receive the value of the bill and the bill will be added to your “Collector’s Bills” ledger. Collect all 5 Collector’s Bills and you’ll instantly earn a 20 SB Bonus! Keep searching til you find them all! Always fun to see what a search will bring. Enjoy and happy earning!