reifendirect is definitely the way to go - cheap and easy. One of my colleagues had a conversation with a car garage, and they pointed out that reifendirekt is cheaper than they get them at trade due to the quicker turn around time the garage requires.
I'll have a post on here selling some 17 inch audi alloys with winter tyres... once I get up to the required 10 posts to place an Ad!!!

We went to ATU but in Germany when my dad was here.

Nice staff, good service and all done within one hour.
They even took the old ones of my hands and disposed them for me.

http://www.atu.de/pages/shop/home.html

* note i am not affiliated with ATU *