Anybody who thinks bike shops are taking the piss we don’t like this as much as you, the scale of the rises was never revealed to us, if I had known I would have ploughed some money into Shimano stock.
Margins on some Shimano have been reduced even though the retail has risen dramatically.
There will still be alot of shops with old stock kicking around, that would explain the price difference.
Back to the OP however it seems to me that the chainset has just risen in price, I personally think this is taking the mick somewhat, I’d suggest speaking to trading standards.