Xerox Spot Color

I'm not sure whatever happened to these machines, but you used to be able to find them at Kinkos and places like that. They had a 'blue' and 'red' setting, so you could put your copies through the machine twice and get a 'spot' color result. It was pretty primitive (you'd just do these on a color printer now), but, it wasnt that long ago when color prints were WAY more expensive then the are now.