Samsung Galaxy S10e (3 colours) $878 @ GainCity Online Store
Probably the cheapest in Singapore for local stock with local warranty.
All three colours available: Prism Black , Prism Green and Prism White
Can try price matching at Harvey Norman (They could not in my case) or Courts (Successful)
On top that Samsung is running a promo of additional 200 cash back on trade ups of galaxy devices for s10 series purchases (s10e included)
With trade up of galaxy s8 (Up to 425), effectively s10e may end up costing close to 450 (878 – 425) which would be an exceptional price. YMMV on trade up value