To be honest, I'm not sure exactly what you're asking here... I don't know anything about the prices of used X-rite densitometers, but a few years ago I picked up a beautiful Gretag D200-II with several aperture, calibration scale, and manual all in its original hardshell case for something like $150. Being a loose practitioner of the Zone System for B&W photography, I had wanted a densitometer for many years, but couldn't afford one back when they were more commonly available and used in daily production. Nowadays, though, you should be able to find a nice unit for a decent price. I wouldn't worry too much about the name one it...just make sure it works and you can calibrate it. For the record, after testing many films over the years I've never used a step wedge.