The city centre retailers have suffered in previous years as consumers opt for shopping centres in the suburbs which provide cheaper parking.
But now anyone can park in on-street car parking spaces for just €1 per hour every Saturday and Sunday in December in the core trading area in the city.
The new offer gives a reduction of €1.90 per hour on Saturdays and €0.40 on Sundays.
It would provide savings of €5.70 on a three-hour shopping trip on a Saturday.
The facility will be in place on more than 800 on-street parking spaces and a special sticker has been put on parking meters where the offer applies.
Motorists who sign up for the Parking Tag will have the facility available in a wider area.