have offered a price of £135 for a pair if we can get ten people for a group buy - still expensive compared to eBay of Germany though! AutoBulbs usually charge £170 for a pair!
TSR - The Retrofit Source (USA)
have offered a $10 discount per pair if we get five or more for a group buy. With postage at $44 for all five pairs the overall price after conversion comes to £135 - same as Autobulbs.
I've emailed some german sellers, the guy from eBay got back to me but his offer wasn't for a discount but to include some LED's free... His price is still the best though at €124 (£100) for a pair plus postage