7800 and 9800 are still very useful. I have a 7800 and 7880. Picked up each for dirt cheap and cleaned the capping stations, the wipers, the printhead (with piezo vapours). The 7800 is running a Karbon-8 set. As long as you keep it clean it should run for years. You could even source some on Facebook marketplace and craigslist and harvest the parts eg: air pump, motherboards, cables, tubes etc.. and use that to maintain a working machine.
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