Came across these. Seems like a good deal.
They are shrink wrapped in packs of 10 which is nice rather than all loose packed in the box.
From a comment below:
Image on product shows the standard is: T/CTCA 7-2019
According to TGA's guidance(tga.gov.au):
Due to the lack of resistance to fluid penetration, masks designed to certain standards or subclasses of some standards (listed below), may not be suitable for use in medical or surgical settings.
These masks may still be appropriate for use in non-medical/healthcare settings to assist in reducing airborne disease transmission, along with social distancing measures.
4/1: Thanks to forum ninja who purchased the mask, they are listed as GB/T32610-2016. See here for more information.