@Apex,
@CPTMiller, can share how the green Starhub prepaid SIM and which travel SIM are better, cheaper and more convenient than the CMLink?
For CMLink, it's about $10, including 6Gb data overseas. Their billing cycle is standard for everybody from 1st to 30th/31st of a month. If you are traveling say on the 15th for 4 weeks, you'll literally get a total of 12Gb roaming data across 2 billing cycles.
I found this probably the best and most convenient deal around.
Would love to see other better options but researching on the Starhub green prepaid suggested otherwise. Not sure what other "travel SIMs" are available out there though ...