Question about Epson SureColor SC-P900

The matching cartridges are specified by Epson on the product page of the SC-P900 (at the very bottom of the page, section "Ink and accessories"). There are 10 of them with the following type designations: T47A1, T47A2, T47A3, T47A4, T47A5, T47A6, T47A7, T47A8, T47A9, T47AD. Epson's part numbers are C13{type designation}00, so for example C13T47AD00 for Photo Black or C13T47A600 for Vivid Light Magenta.
By searching for these article numbers, you can also find them in Switzerland. Caution: In the case of supposed hits, check again carefully that the item number is exactly right before buying. Sometimes "similar results" are displayed, which then do not fit. The cartridges for the SC-P900 hold 50ml and have a mostly white label.

Ah, so you grabbed the other of the two copies that were available recently ;-)
Unfortunately, according to the community guidelines, I am not allowed to mention offers from other suppliers here. But the inks are available in Switzerland, even if they are rare. Try the following: Search for the item number on a price comparison site. These prices are "top", you could say. Search there for C13T47A600. I got the inks delivered the day after Christmas from a dealer who claims to offer "printers for you".