NEWYEAR25
Powerbulbs currently have 25% when you use the code NEWYEAR15. I'm not sure when it expires as there is no dedicated page for terms and conditions (one would assume new years day). There is however, free standard shipping on certain items.
If you spend over 15GBP (~30AUD) you get a free gift of OSRAM W5W Sidelight Bulbs
On their recent sale I bought a pair of Philips X-treme Vision H1 headlights which were packed well, arrived within reasonable time and came with a free pair of bulbs (which I am yet to use).