Do you have a picture?
Condition, cleanliness, and inclusions are what matter the most. If you have a picture with everything that you have for it, that would be helpful. Hose, suction unit, attachments, bags, not sure if that unit has an electric power nozzle. Cleaning it up is helpful. Its amazing what a rag and some glass cleaner to an exterior will do.
With all of that, we can be much more helpful on here!