Hertz: Economy car rentals from Florida / day ... with a catch

Ending today, Hertz offers its Drive-Out Economy Car Rentals for $3 per day for up to 4 days via coupon code "1WAY". (Weekly rates start at $9.99.) What's the catch? You must pick the car up from any of seven Florida airport locations and drop it off at one of 36 nationwide locations. (Destinations include Boston, Newark, Detroit, and even Phoenix, AZ.) These rates apply for all vehicle pickups scheduled before June 30.