I just ordered a Dell OptiPlex 3020 small form factor desktop, with an i5-4570 processor, 8GB of RAM, a 500GB HDD, and Windows 10 Home for $190 including tax. I don't know what kind of optical drive it has (but it does have one.)
No mouse, keyboard, or monitor.
Not sure if I'll keep it, or donate it to the church after playing with it a while.