Hi Leon,
There are a few adverts for the 5D on facebook market place and gumtree, here is one from Cashies, with whom you could also easily organise shipping (perhaps important due to present lockdown) and also have a few months of guarantee (ckeck with them).....
https://www.gumtree.com.au/s-ad/croy...09-/1278790651
But on the point of the 5D, and whilst it's none of my business, if it was me, I'd go for the highly revered Canon 6D, possibly at or near the same price, which has a much lower noise sensor, if interested I can post a comparison of the two at medium/high iso. Anyway, here is a well priced example.....
https://www.gumtree.com.au/s-ad/brun...nly/1279050668
best
JA