Refurbished computers

Hi

I'm looking to get a refurbished computer (most likely a desktop) because my laptop doesn't have the specs needed to run properly to do TAFE Digital studies. While I'd love to buy something new & higher range, a disability pension doesn't cough up for that, so refurbished it is!!

Does anyone have any experience with buying a refurbished computer in the Sydney area (basically anywhere that counts as Sydney, suburbs & to the Gong) (either in store or online), & any tips? Thanks