For a month or two now the front passenger side shock absorber has been getting gradually worse.

Can I get this changed without changing the other shock absorbers?

Also, what kind of price would I be looking at for a local garage to do the work, including parts? So I have an idea of the price and don't get ripped off.. Thanks

yes you can but ideally you should replace both really and price was am not sure my mate fitted my eibachs at his garge for £100 best just getting few quotes

always havew both replaced or youll see how bad a focus can handle with a worn shock one side and a new one the other