Check out the prices on some full sets on eBay, some people more money than sense.
https://www.ebay.com.au/sch/i.html?_nkw=coles+mini+collectables+full+set&_sop=16
https://www.ebay.com.au/sch/i.html?_nkw=coles+mini+collectables+full+set&_sop=16