Use the code HOLA10 for $10 off a medical certificate at Hola Health.
Single day: $6.90 (usually $16.90)
Multi day: $29 (usually $39)
I just received a 3 day certificate for $29 within approximately 5 minutes of applying for it.
Edit:
For those of you questioning why it costs more for multiple days, they require you to consult with a Telehealth consultant (via video) to be approved for multiple days, whereas you don't have to for a single day.
Most GPs don't bulk bill since COVID, so you'd end up paying more at the GP, or lining up for hours in a germ-infested waiting room