I'm pretty sure you can't get large quantities over here (none of the stockists say they offer any such, anyway). Although I have found this lot selling them for £7.99 + £1.19 if you want the cord as well, which is an improvement.

Could you prod me a couple of weeks before you're next due to be over & I'll see if there's enough folk interested to be worth a bulk shipment - thanks for the offer!