Alixexpress from China. I got sick and tired of paying ridiculous prices for HP ink cartridges. Had three sent from China Aliexpress - took about 3 weeks to arrive in Europe. Perfectly fine quality both in color, black and white.
Just an example below (not sure of Pprune will let me post it):
https://www.aliexpress.com/item/4000...archweb201603_