Disclaimer: This is a work in progress and will be updated as time passes by
Every first/last weekend of the month, there is bound to be food factory sales. That is, wholesale selling of items at a discounted rate
Examples are the ones I just posted today(Zac's Butchery)
One that is well know is Woodlands Terrace. Popular are Melvados, Fassler. Other locations are Pandan Loop, and in Tai Seng region, kampong ampat ka foodlink. Ubi also also has wholesale selling of more traditional local delicies like Roast Duck at $16(UP $32), Popiah Skin, Satay.