This is my most favorite durian shop in Singapore. I have tried several durian shops in Geylang, Katong or other Chinatown areas, and then 101 Fruits 花果山 Durian is the best in pricing, year-round availability, trustworthy and friendly owners.
I tried another one close by, I have paid almost SG$250 for two durians, then I paid less than SG$100 for two next day. Both were same brand, Mao Shang Wang (貓山王) and the quality of 101 Fruits was even better! Since then, I simply trust Agnes, the owner, to choose the right brand and size for me (us).
Furthermore, there are tables and chairs kindly prepared, with gloves and tissue papers for eat in there. Plus water faucets are available to wash your hands after eating, so that you won’t be durian-stinky after you enjoyed it.
There are numbers of durian shops lining up on Simms Avenue in Geylang district but they will be closed in off-seasons. However, 101 Fruits in Chinatown is always open and conveniently located. From MRT Chinatown station, walk 2 blocks and they are in CK Department Store building. Or if you take bus, New Bridge Ctr bus stop is just in front of this building.