Have you actually done this AoA?
Umm, yeah probably several times per year, best place to head is Chinatown doctors where they will provide you with bulk billed certificates still, but I just go to my local doctor non bulk billed but only out of pocket is around $32, then you can claim it on tax as it is an employer requirement to get the certificate and its another 30-40% off. So yeah I guess it costs money at worst $20 or so.