Occasionally a set will come up on ebay but they tend to fetch a good price. With the sad demise of VAGparts it's pretty much down to a dealer for them now I think. I got a price from Stoke-Audi of about £82 delivered - give them a try in their section on here.
Unfortunately ebay.de which is normally a good source of reasonable priced Audi bits only tends to have LHD ones.