On the Dell website, you can check out their workstations and see some of the price differences. For example, choose the Precision line. Then for any computer

On the Dell website, you can check out their workstations and see some of the price differences. For example, choose the Precision line. Then for any computer that has a "show all choices" when it lists the operating system, choose the customize option and you can see the prices for all the OS options they give. I randomly chose an i5 desktop and from Windows 10 Pro switching to Ubuntu 20.04 reduces the price by $75, but switching to Red Hat increases the price by $70.