I bought my bulk cartridges on alibaba, very cheap, no issue. then use dye water based black ink that I buy per liter.
Don't forget to get a chip resetter.
With a RIP you could assign which slot is black or not. (not obliged to have all black slot)
Some use 4 slot for film output, the other 4 for sublimation printing.
With decent knowledge and 1 black slot, you can successfully output film.
With many black slot and a RIP, it will print faster and ease the process.
For black I use inktec dye water based ink, I think it is easy to find in your area.
Don't forget to get a chip resetter.
With a RIP you could assign which slot is black or not. (not obliged to have all black slot)
Some use 4 slot for film output, the other 4 for sublimation printing.
With decent knowledge and 1 black slot, you can successfully output film.
With many black slot and a RIP, it will print faster and ease the process.
For black I use inktec dye water based ink, I think it is easy to find in your area.