Good to hear from you, Eddie. I am going to stick with my i9900. Photo quality wise I don't think there is anything better out there. And the archival quality is excellent as long as the pictures are under either glass or a transparent sheet in an album. Prints do fade, however, if displayed without any covering. What's your experience with the ip4000? How does it compare.
To answer your question, the lowest price for the BCI-6 cartridges is definitely $9.95. Amazon offers the 8-pack for $68.85 incl. shipping. That's by far the lowest price anywhere.
Hope all is well and stay in touch.