if its a ss and you want a fixed, look on craigslist for a used/cheap fixed wheelset. That and some foot retention/brakes if thats your thing.

Assuming the wheelset was coverted to ss and not bought as singlespeed/fixed gear (as we say in the biz a 'flip-flop hub') your best bet and quickest solution would be new wheelset.

if you cant find any thing on CL, then go to veolmine