I have an R300 which has the same print head as the R200 and, I assume, the R220.
It's used only occasionally and often only for s short piece of text - sometimes I run a few photos off. I've never had streaking, blocked heads etc and this is with compatible cartridges.
Cheapest place for Epson compatibles I've found is:
I bought three full sets of six cartridges for £3.98 each plus p and p, which came to £17.81.
Gone up a tiny amount since:
I haven't used mine yet, but they are branded Sumvision of MP3 player and USB storage products fame.