Advise a good simulator home for $500 ?

Depends on which simulator you want. There are a lot of station wagons. I don’t remember their titles. You can go to https://gymequipmentcenter.com/best-rowing-machine-under-500/  and look at them. By the way, I bought myself a simulator and fitted myself with a room for it. And all thanks to this resource) I even stopped going to the gym, at home I feel much more comfortable.