Where can I find a lockable tv mountain?

Based on your question asking for a lockable TV mount, I would recommend either the Equip 650319 32"-55" Economy Slim Tilt TV Wall Mount Bracket for R223, or the LinkQnet 32 - 70" Low-profile Tilt TV Wall Mount Bracket for R180. Both of these mounts have tilt functionality for adjusting the angle of your TV, and include locking mechanisms for securely fastening your TV to the wall. They should work well for TVs in the size range you specified. Let me know if you need any other details!