Replacement Tartarus Pro Key

Hi folks,
I was running a stand at a local games show and someone 'borrowed' one of the keys off my Tartarus Pro
It's the 20/Space key.
I'm probably not looking properly but I can't see spare keys on the Razer site - Given it's a current product I'm sure these must be available - if someone could link me to the right place I would be truly grateful!
I'm based in the UK if it makes a difference.

Best wishes

Steve