Zwift with a rowing machine

I want to start using a row machine to train my fitness with Zwift but I don’t really know how, I see many people using a concept 2 but this is not a really cheap option to start training, has anyone experience with connecting cheaper rowing machines, and if yes which model?

I’ve only heard of one other rowing machine that works with Zwift: The Waterrower. Unfortunately it’s more expensive than the Concept2.