https://www.groupon.com/deals/shell-natseems like a decent deal. valid at participating Shell gas stations.Link to find participating Shell Gas stations. https://www.fuelrewards.com/fuelrewards/locations?show=frn&partSourceId=groupon&utm_source=campaign_source&utm_medium=email&utm_content=campaign_content&utm_campaign=campaign_name&WT.mc_id=groupon Note: Rewards Cards expire within six months of date of purchase.