that is stupid, the absolute most they should cost is £50 and that is the max price for just rining up and requesting one for the sake of it. If you have a fault and require a new shub you will get one for free.
That being said, if you are after a new router and are happy to pay for one you would be better off putting your existing shub in modem mode and investing in a 3rd party router (recommendations can be provided upon request
)