There is this shop that I walked past the other day at Toa Payoh HDB Hub. From the MRT/NTUC area, towards the bus interchange. Last shop before the bus interchange glass doors (near the Burger King). Not sure what the name is, but if you live in the area... Prices are nothing to shout about though, compared to the Mass Orders I've seen here. Yes, they have all white , IIRC.