I still have a note on my phone from when I did my heater core. I got it via a workmates son in law who worked at a local dealership at the time. It cost me £282 including VAT (sales tax). Not sure what discount that was at if any, but it was in 2017. It may have came from the central european parts warehouse as there was a few days delay before it got to the dealership.
I don't know what the quality of these are like, but they ship worldwide and you'd have to contact them for a shipping quote...
https://www.ebay.co.uk/itm/293257916...1&isGTR=1#shId