Hi !
Welcome to the forums, if you aren't already then also sign up over at sxoc.com!
Slave cylinder can be had for around £15 on ebay, and possibly from onlineautomotive.co.uk , misterauto.com(?), or brakeparts.co.uk for other prices.
May be worth removing the damper and fitting a braided line while you are down there, buy a full lenght one (£22) for an S13 and you should be golden!
Enjoy!
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