Just bought this Dotafa (4-ply surgical mask made in Vietnam) mask from Qoo10.
The quality is good, with good thickness (see picture below). Delivery speed is fast as well (just 2 days using Qprime delivery). Only issue is the expensive price (around S$1 per mask), but that is the market rate nowadays…
The consensus is that made in Vietnam & made in Indonesia (3-ply or 4-ply) are the best options to get nowadays. This current batch may be the last batch since the respective countries are cracking down on the export of masks.