I've used the refill service at Costco. It's good stuff. I didn't like three things about the service:
1) It typically took them over an hour just to do one cartridge. This was not convenient for me.
2) A cartridge, once filled, had a shelf life of 90 days I believe.
3) Since I didn't use my ink that much I couldn't really rotate cartridges out, so when I did run out of ink, at a moments notice, it was a pain in the ass (I don't live that close to a Costco).
I just buy my ink at Amazon now.
I've done the Ebay thing as well and it was so-so....
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