Hi, indeed they are not free. You may compare prices from
http://www.norbsa02.freeuk.com/ , I got mine there, 35\35w, have lasted a long time and the light output is pretty amazing. Then fit a 10w halogen BA9s for daytime running and you will find your battery is always charged. Anyway not expensive when one thinks about safety. Try it, I'd be very amazed if you do not end up smiling. Please go to
http://www.audioworld.net/BSA/forum/index.php?topic=93.0Regards
E.