I personally, do not like inkjet for decals. I’ve had sub par results, even with the Testors decal coating. Mine run.
I bought a laser and it comes with intro cartridges. Meaning they are not the full bore cartridge. New ones are very expensive. Ghost makes a white cartridge but it is also very expensive. However, it can do 1400 pages. If you look at your sheet as 4x6 it’s not too bad as you can multiply that estimate x 4.
Today’s printers are cheap but ink and toner are expensive. Don’t prebuy ink. The printers also have a shelf life. I had an HP stop and gave me a code. It needed a print head. 2x what a new printer cost. These things are made to die.