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