Where to buy durian in SG?

Hello guys in SG, nice to meet u!

I am a traveler from CN and this is my 1st time being here.

Ive seen there's store selling durian in Chinatown and Geylang with amazing price, and there's some store selling with 10x in other street. I am curious what is the difference between em? or any recommend store in SG? thx!