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Yeah, that's the price you pay in a shop. At least it was, 12 months ago.
Still £209 at Wiggle
https://www.wiggle.co.uk/shimano-ultegra-r8050-di2-rear-dearailleur
A rear derailleur?
The GRX has a better clutch too compared with the Ultegra RX I think, that could help on your 324 links chain