I would say that it realy depends on where you live, for Germany i would recommend eBay Kleinanzeigen.

In Germany we call it Hassliebe and it describes perfectly what i have with freecad (stupid import an stl way)

Maybe you can Print something Like this First layer Test (https://www.printables.com/de/model/252059-perfect-first-layer-test) so we can get a closer Look at your First layer

Two questions: how high is the nozzle away from the printbed when you Print the First layer and have you done a Testprint to check the bedlevel

Have you leveld the bed allready, it needs to have the right distance to the nozzle everywhere.