Bought the Anker PowerPort 6 5V/12A 6-Port Wall Charger on Amazon for US$20.49 (S$29).
Its usual retail price is US$26.99 (S$38) but because of an ongoing promotion, you can use the promo code, GEYC7LFE, and it will give you a discount of US$6.50.
Anker PowerPort 6 5V/12A 6-Port Wall Charger
