I bought 2 sets of HID's a while ago from www.hq-auto-lighting.co.uk and had a good service from them. So much so they sent me a 30% off code and have aggreed to allow me to post it up on the forums I use.

For your 30% off quote discount code: LA4UTF

Example prices (After discount):Non can bus slim ballasts: £41
CanBus one: £44