Just wanted to add some info on these (I posted the CL ad):
The 1050CM unit probably needs new ink, printheads, and might need a new ink tube system. When I fired it up last month, it printed 3 of 4 colors decently, but was giving me Replace Printhead messages.
The 5500 unit definitely needs a new carriage belt, ink, printheads, and likely a new ink tube system as well. SAMINK dot com has ink locally. MyPrinterShop dot ca has printheads. LPSComputer dot com is in the US, but has inktube systems and carriage belts. They also have a ton of very informative repair videos on YouTube.
The 5500 is the better unit, but a bit more $ up front. I know a few printshops in town still use these units, so they might be able and willing to donate some older ink and printheads to help get your feet wet.
Hope this helps.