What price are they asking? Also, in terms of what to look for..... a good warranty due to a couple of issues that haunt the fsi motor. Oil consumption (piston ring blow by), cam follower, and intake ports sludge build up. Unfortunately these are all items you cant directly asess at the dealer.
Also check all high frequency switches (window switch, door lock switch, radio buttons, and the like), the window screens for structural integrity.
Dont be scared by what i have said because im happy with ours and overall, its a good motor and fairly reliable.
At the time we got our wagon in 2010 we paid 24k from the audi dealer.