Hello Bob,
Where are you located? You should be able to find the toner for this machine. Have you tried
www.precisionroller.com ?
I am almost positive that they carry the toner and also consumable part as well as replacement parts.
One of the reasons the copies might be dirty, is that the optics, charge wires, cleaning blade, drum, and or fuser unit might need some parts replaced. Without seeing a copy of what the machine is actually doing, or looking at the machine, it's hard to pin point exactly what is going on.
If you have any questions with the machine, feel free to post any questions and I will be glad to help you.
Good luck.
Hope this helps.
Mac =)