Similar to the Velocity E-Store where you can log into your account before completing purchase - Singapore Airlines appears to be offering a similar service with Krisflyer points.
Velocity earn rates are higher for some reatailers, lower for others (See comparison below), and their retailer list appears to be more australian friendly, but the Krisflyer stores may appeal for those stores not listed on velocity. It also depends how you value Krisflyers to Velocity points.
Apple
Velocity $1 = 2 points
Kris US$10(AUD$10.60) = 25 points = ~2.35 points/AUD
ASOS
Velocity $1=2 points
Kris US$10(AUD$10.60) = 23 points = ~2.16 points/AUD
Ebay
Velocity $1=2 points
Kris US$10(AUD$10.60) = 19 points = ~1.79 points/AUD
Strawberry net
Velocity $1 = 2 points
Kris US$10(AUD$10.60) = 12 points = ~1.13 points/AUD
But it says points are calculated per $10 usd spend , so if you spend say $9, you get no points ?