Depends on your budget.
OTR suits from Suit Supply at ION Orchard can cost $1k too. And you have to pay for alterations. Might as well get it tailored.
On the other hand, if you're ok with a fused suit, I'm quite sure you can get one within $500-600. Up budget a bit more, maybe can get a canvassed suit from Sze Sze...
OTR suits from G2000 will cost around $300 for a set? Not sure...