I purchased mine off some UK seller on Ebay got them delivered in about 2 days from clicking on Buy It Now. Fitted them and they work a treat and have a nice amount of light coming from them. Been over a month an no flickers etc... Paid £23.95 and Free delivery
Link if anyone wants to check out their other listings as they seem to do bulbs for various models and makes etc..... is:
http://www.ebay.co.uk/itm/1817470387...%3AMEBIDX%3AIT
They come with a 12 month warranty and as stated above you at-least have PayPal Protection etc...
I think Horizons are buying them in from China. I have seem very similar looking bulbs on a App for the phone called Wish and they are straight from the manufactures (I Think!) and about 1/3 of the price too. I got my number plates lights from the app and my BMW Logo puddle projectors both cost combined £14 with free postage and arrived in 9 days which was quite good I thought from China!