Hi Adam, for Marina Bay Sands The Shoppes, they are offering free complimentary 1 hour parking coupon from Monday to Thursday excluding Public Holidays. It is valid with any spend on takeaways at selected F&B Outlets, until 30th November 2020.

You can check out the other free/ cheap parking spots here: https://www.motorist.sg/article/513/free-parking-in-singapore-2020-edition