This is an entire kit that includes everything for your application (upper and lower control arms, sway bar end links, tie rod ends, and all connecting hardware):
http://www.blauparts.com/audi/audi_c...arms_kit.shtml
Since you will have the entire assembly apart, it just makes good sense to do it all at once. The only problem is they are currently out of stock until middle to late March. If you can hold off that long I think it would be worth it because the price of the entire kit is less than just buying individual control arms.....about $500 for the kit and that includes both sides (a total of 8 control armsplus all the other parts).
They even have a pretty good "how to" section if you plan to tackle it yourself, and just for the record it is best to do both sides at once because if one side is bad, the other side isn't too far behind. Better safe than sorry when it comes to suspension parts.