There are dealers on eBay that supply toner with the computer chip so your printer doesn't know it's not the manufacturers toner. I've used it before without any problems. There are also dealers that have small print that says "you have to modify your printer to.... bla bla bla" -- Be sure to read the fine print to avoid those jerks. "Tools needed : soldering gun...." yeah, sure, I'm going to solder my printer. Got my money back, bought from someone else.
This guy literally has 8,900 listings for toner. You cannot sustain that number of inventory if your stuff is crappy!!! And he has 100% feedback on nearly 90,000 sales. Really a hard number to achieve. The picture at the bottom are the units I have saved for when I need to refill. As you can see it's almost 10 times cheaper....
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