Depends on what you're going for! Single colour? Then ebay is your best bet!
http://www.ebay.co.uk/sch/i.html?_trksid=p5197.m570.l1313.TR0.TRC0.Xyzf r125 halo&_nkw=yzf r125 halo&_sacat=0&_from=R40
I have Multicolour ones, but they can't handle the heat, so can't really recommend them (They break)
With these angel eyes do they act as actual headlights? How would I install them or do I need to have a mechanic do it for me? I want to get the blue ones but fear they may be illegal in the UK