Scirocco Central

Hi after my 65 plate 2.0TDI R-Line started squeaking over bumps from the front end so I booked it in to Vauxhall dealership (I bought it from there that’s the only reason) after investigation the the technician confirmed it was the anti roll bar bush. He lubricated them and stated allow to soak in and dry then if the problem still consists these can be replaced at £348.60 inc VAT & fitting

Seems a bit excessive I know it’s a dealership but Surely this can be done cheaper if they do need replacing?
Is it a big job replacing them?

Thank you