Just to share that, in case you are looking for 3-ply surgical face mask and unable to get it from store/pharmacy around your area, or the price has already jacked up, you can actually buy from the Internet, which will deliver to you at your doorstep within 1-2 day, and the price is reasonably cheap.
For example, if you look around in Lelong website, you can find seller selling 5 boxes of the 3-ply surgical face mask (50 pieces per box) at the price of RM33 only, which is equivalent to RM33/250 = 13.20 sen per piece.
If you are looking for lower volume like 1 box (50 pieces), there are sellers selling as low as RM10 per box, which is equivalent to RM10/50 = 20 sen per piece.
As for the correct way of wearing the face mask, the right one should be the coloured side face away from you, while the white side touches your face. There are some rumours spreading around the Internet saying that in certain cases you should wear with the white side in front, which I believe is not true. Whether you are sick and want to prevent virus spreading out, or you are preventing yourself from inhaling harmful substances from outside such as haze/dust/virus, just wear the face mask with the coloured side in front. You can refer to many professional medical websites or government healthcare websites to get the correct info. One of the websites is this: http://www.primed.ca/ClinicalResources/MaskStandardsandFAQ.aspx