There are some dutch websites that still sell the 5, but they are more expensive then the 6.
https://www.redshell.nl/fairphone-5-5g-6gb128gb-matte-black/
https://www.dustin.nl/product/5011353811/5
It's hard to justify to myself to spend so much money on a last gen phone that would also take alot of time to get running.