I would try and get them under $30k.
While these cars are rare (< 10 335ix mt CPO on BMW site), I was able to get down to about $29.5k for the following:
2009 335xi CPO
6mt
38k mi
Premium
Sport
Logic 7
CA
Sunshades
not really needed, but my interior is black.
New tires
Location - Metro Detroit...so not that far away from the car you are looking at. When I was looking there were 3 335ix lci manuals within driving distance. None of them lasted any longer than a month. Be prepared to move quickly.
Check the maintenance history, tires, and push them about the bumper. You should be able to get below $30k.
I really enjoy my car!
Good luck and I hope you beat my price!