Try Oponeo.co.uk. I found Toyo Proxys in 205/45/15. I haven't order anything from them yet, was told about the site from a lad at work. They are based in Poland.
I had 50 on my GTI and the rubbed then I got the Proxys 205/45/15 from a Motorsport company near me here in Ireland, It took them 2 weeks to get them. It was after this that I heard of Oponeo so haven't had to order from them yet.