^ This ^
Trusted source. Many of us have been buying from them for years. You pay exactly the value of the card, us$50 for us$50 card, no mark up. Can use SG cc or paypal. Instant delivery, you can get the code from the site immediately when the transaction is done.
Plus once in a while they have 10% off, sometimes with conditions like discount only applies to $10 or $50 cards. Can only buy 1 card during discount though. (They used to have frequent 30% off last time, now don't have liao.)
For your first transaction they will SMS you a code for verification, so make sure you enter your real SG mobile number when creating account there.
Note: Some times for certain value cards they charge an 'activation' fee. You only see this in the checkout screen. So check carefully. Not a problem though, if $20 card has activation fee, just buy 2x $10. (Haven't seen this fee recently, not sure still have or not. Never seen it on $10 cards.)