Now is the Durian season.
I don't know whether people have posted something related to this already.
Let me recommend my favourite places to buy Durians!
1. Jurong West Street 51
(near entrance to the carpark)
There are 2 stalls there. Buy from the stall right at the corner, in front of the provision shop.
2. Keong Saik Street
Near lift of the New Bridge Centre
These are the stalls I visit and buy durians from them frequently.