Cheapest heating oil?

Real Estate
1

I am using https://www.heizoel24.ch to find the best deal, but perhaps people here have other tips.

2

if you find neighbors who are willing to coordinate purchases with you, you can combine your purchase and get significant better per-liter prices due to larger volumes.

Buy off-season (e.g. not during the winter)

4

Would you care sharing some other suppliers? I checked coop and micros and they were both more expensive than the single supplier suggested by heizoel24

Thanks