Right now you can purchase a $20 Sears certificate for $10 through Groupon.
Save an additional 16% (new Groupon customer) or 7% (existing customer) buy purchasing the Groupon through TopCashBack.
1. Sign up with TopCashBack.
2. Enter Groupon in the search box.
3. Click the appropriate orange "Get Cashback" button.
4. Sign up with or into Groupon and enter Sears in the search box.
5. Purchase a $20 certificate for $10.