A Turkish company has developed a real life working Transformer, and they are actually going to be selling them.
Letvision developed the Letrons project, which created a BMW that can transform into a remote-controlled robot form. The first Letron is the red leader “Antimon”. Right now the car can only be driven by remote control, and as of yet the robots can not walk. They say given enough funding for R&D a walking feature could be developed.
Antimon is just the first of the Letrons as they have designs for four more robots of various colors. And yes they will apparently sell you one if you have enough money and your desired use for it matches whatever their goals are.
Here’s a video of it transforming: