No, I am in the USA, but I read a lot about vaping in SG (from other ECF members).
+1 on not ordering online (vape products that have to pass through SG customs rarely make it through). If you trust the person who is willing to sell you their mod (and you don't have any local sources) then that is most likely your best bet for now.
Check out this forum:
SG Vapers. Make sure you read all the "stickies" as there are special rules you must follow when posting (in the SG forum) due to the sensitivity of vaping in SG.
You won't be able to ask where to buy hardware/juice in SG as your government monitors/reads
ECF forum posts. It's all explained here =>
Newbies Q&A Thread. [PLEASE READ]
However you can purchase/order some products locally: