Good morning Alan,
if you want to buy Green Compost you should check with the company that is collecting the garden waste in your region. Could be that it you will have drive some distance to get there. It might be easier to get manure from Cow or Horsefarms nearby. Ask the farmers to confirm that they did not spray their land with aminopyralid becuase it will kill or damage a lot of the vegetable plants next year. Commercial name of aminopyralid is Simplex.
You may also check with the your neighbours or the “Raiffeisenmarkt” where to get good compost.