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Extracted from:
http://blog.moneysmart.sg/car-ownership/cheapest-parking-orchard-road-cars/
'Off peak – weekdays before 5/6pm
Plaza Singapura: $1.07 for first hour, $0.32 for subsequent 15 minutes (before 6pm)
Park Mall: $1 for first hour, $1 for subsequent ½ hour (before 6pm)
*SCAPE: $1.95 per hour (before 5pm)
Peak – weekdays after 6pm
Park Mall: $2.00 per entry
Atrium @ Orchard: $2.14 per entry
Plaza Singapura: $2.14 per entry
Street parking at Anguilla Park, Grange Road or Penang Road: $0.50 per 30 min
Saturdays
Park Mall: $1 for first hour, $1 for subsequent ½ hour (before 6pm), $2 per entry (after 6pm)
Atrium @ Orchard : $2.14 for 1st 2 hrs; $0.32 for subsequent 15mins (3am to 5:59pm); $2.14 per entry (after 6pm)
Plaza Singapura: 3am-5.59pm: $2.14 for 1st 2 hrs; $0.32 for subsequent 15mins (3am to 5:59pm); $2.14 per entry (after 6pm)
Sundays
Park Mall: $1 for 1st hr (before 6pm), $1 for subsequent hours; $2 per entry (after 6pm)
Street parking at Anguilla Park, Grange Road or Penang Road: $0.50 per 30 min
Atrium @ Orchard – $2.14 for 1st 2hrs, $0.32 for subsequent 15mins (3am to 5:59pm); $2.14 per entry (6pm to 11:59pm)
Plaza Singapura: $2.14 for 1st 2hrs, $0.32 for subsequent 15mins (3am to 5:59pm); $2.14 per entry (6pm to 11:59pm)'
Last update was 9/2014(as indicated).