Wytron makes a unit called DVD-319p which is the designation for their little 1 to 1 barebones unit. Go to their website in Taiwan in order to check it out. Don’t let the 8mb cache worry you. 1-1 units need very little cache in order to run fast. These units come with a USB connecter as well.
I have a line on these units, new in the box, with manual, IDE cables, usb and power cables. All that needs to be added is a pair of drives.
Cost? Hopefully under a hundred bucks, before shipping. Orange County Ca. location, so possibility of pick up.