I guess the Canon 270ex is probably the cheapest canon flash with bounce. It's right around S$200, a bit more I think.
I used to use Vivitar 285HV flash units. They are UGLY, with a design that comes straight out of the late 70s. This would also be a "manual" setup, so you'd have to set the flash power manually (basically). There is a semi-auto mode on the flash itself (not TTL, but thyristor based mode) that makes it a bit easier, but it's still quite a bit more complex than using an integrated unit with TTL. Come to think of it, I don't know much about your camera, so I'm assuming it can use TTL. Anyway, the Vivitar units are bulletproof, with lots of power, good battery life, and reasonable re-charge times. I never had one fail ever. (disclaimer: the very old 285HVs used a higher trigger voltage that could potentially damage your camera. Don't buy very old / used copies of this flash).
The Vivitar in the US can be had for $90 new, but I don't know how available they are here. I assume they are around, they are monumentally popular in the US for "off camera" key use and strobist type of work.
Of course there are other brands, like "Seagull", which I've seen a lot in China. I think it's basically a better looking version of something very much like the Vivitar. Probably manual, and I don't know about reliability. I know they are in Malaysia (they are on the Malaysia ebay site for like RM144). I'm sure there are other non-canon brands made in asia somewhere (China) that are inexpensive and reasonably ok.
Hope you find what you're looking for. I would probably recommend getting either something REALLY cheap, or go for a nice unit from Canon so that if/when you eventually upgrade your camera you'll have something that works nicely with it.
