^^^ I'm a Canon man myself.
Epson are pretty good and you can buy remanufactured ink or refillable ink.
I would avoid non-OEM inks. They can actually ruin a printer. I've seen it happen.
That is why I need a new printer :/
That depends, you have to alternate the ink, use an original ink, when original ends change to non original,and when non original ends again with original and keep alternating that way, 1 original 1 not original.
I don't use non original ink but using it that way won't damage your printer