There are standard docker images available [0]. Not sure why you would you virtual images when there is an easy install script and a docker.

While I agree it’s a complex beast (it’s an ERP system), there is a large community [1] and active forum.

Also if you are happy paying $300/month for a proprietary product, why would you expect the same for $0 from an open source product?

[0] https://github.com/frappe/frappe_docker

[1] https://discuss.erpnext.com