A small saving but hope this helps someone.
Citibank – 5% off Tours & Sightseeing, 5% off Spa & Dining options available in Singapore, Bangkok, Hong Kong, Seoul, Tokyo and Osaka and Up to 5% off airport transfers.
Payment must be made with a Citibank credit/debit card.
Valid for Singapore, Malaysia, Philippines, Indonesia, Vietnam users (Seems to work for Australians too as it worked for me.)
Promotion valid until 31 March 2019
MasterCard – Extra 5% off tours & sightseeing activities. Promo Code - KLKMCT
The applicable Asia Pacific countries include China, Hong Kong, South Korea, India, Indonesia, Malaysia, Philippines, Singapore, Sri Lanka, Thailand, Australia, and New Zealand.
Promotion valid until 30 June 2019
Used Klook a heap while in Hong Kong and Macau. Simply the best for price and convenience. Beats counter prices (including if you clip those coupons from the city welcome guides) for all attractions, experiences and dining on offer. Added benefit of not having to queue at those venues to purchase tickets, which saves a stack of time and some venues even have klook express lanes which means even less time waiting. Can't recommend enough!!