I went to Ghim Moh the other day to pick up a durian together with Emily and Ryan. Durian season had just started a few weeks earlier and I was craving for some delicious sweet and spiky fruit. The durian seller I mostly go to is called 'Ah Seng' and has a small stand at the fruit market in Ghim Moh (close to Buena Vista). He has a facebook page with daily updates on prices and availability. To be sure of actually getting your hands on a durian though, you'll have to call in advance and reserver how many fruits you want and what kind (the number is +65 9465 6160 in case).
At the stand numerous baskets are lined up filled with reserved durians. Some people where taking home more than 10 durians which to me is kind of crazy. I can usually eat one durian on a good day. Maybe two if they are small and I'm really craving. The durians are bought per kilo and weighed with the husk, usually priced between 5 and 12$ per kilo although high quality durian can easily cost 20$ when supply is sparse.
Ah Seng himself cuts open every durian and smell-testing it before letting the customer approve it. The ritual reminded me of how wine is poured at a restaurant, letting the customer taste the wine before it is served.
We were taking the metro back so I had the durian packed and sealed. It's officially illegal in Singapore to transport a durian on the metro, but as opposed to everything else there is no fine specified for the violation. I supposed they'll just tell you not to do it again if you get caught, but I'm suspecing that no true singaporian could really scold another for wanting durian.