Bimmersport and RMP both have GT1 machines and can both do this for you.
This actually shouldn't be too expensive at the dealer (i paid 58$), but if you do go to the dealer, make sure they tell you how long (labour) it will take BEFORE you drop the car off. This process takes 10 mins.
hid lights hid kits
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's, ZHP knob, GROM, OEM 18's,