I got them from a mate in Germany, I'm trying to sort out a GB, but I'm waiting back to hear on a firm price. I paid about £280 delivered for mine (mates rates!). I'm also working on a supplier here in the UK who is trying to source them. Apparently they are not easy to buy due to some licensing requirement from VW, not sure exactly the details though.
Regarding a mirror for the main beams - no I don't think so. I put some of the + 80% brighter/whiter bulbs in mine and they are very very bright. The difference is like night and day (excuse the pun). The cut off it much sharper, the beam more directed, and further down the road, and you get that kind of bluey/rainbow effect as you catch the top of the beam. So glad I did this mod, not just for the cosmetic nature, but for the effect on my night vision too!