235/50 r16 Tire needed - Help Finding

[Panteledes]

I am in need of a 235/50 r16 tire with 10k or less miles on it to replace my passenger rear tire that is not repairable. I am also in search of a fairly priced set of 17 or 18 inch wheels and tires to replace the entire set. Whichever I can find first, I will go with since I am not really thrilled with the look and feel of 16" tires on an A6 4.2

Any leads would be appreciated.