Digital BW, The Print

I'm thinking about getting a CIS for my epson R220. I have been looking at 
inkrepublic, mediastreet and ebay. What is the difference between these 
models? eby is around $50 compared to $200 for the others. Are they all 
coming from china or some are better built?
Are the cheaper one from ebay leaking ink in the printer?
Thanks for any input. I'd rather pay more to get better quality but it has 
to be justified.
Sincerely,
PO