Just got this email from Hertz:

Summer is here and what better way to start off your road trip than with incredible savings on a weekly airport rental.

To get $100 off Premium vehicles or higher*, use PC# 158745

To get $50 off Economy to Full-Size vehicles*, use PC# 158782

*Excludes Escalades, Adrenaline Collection and Green Traveler Collection vehicles.

Hope it can help someone save some money.