Question about M255dw Color LaserJet Pro - 740324

The price development is kind of blatant, I bought the predecessor model HP M254dw Color LaserJet Pro with exactly the same performance data (from resolution to power consumption) here in October 2017 for CHF 239. I'm now on my second set of cartridges and need a replacement, which would cost me CHF 449 with HP cartridges here...