Well, Bumblebee could try to escape by building a device from the scraps he finds in Megatron's place. He's a resourceful Autobot. He might be able to create a communication device to call for help or a weapon to fight his way out. He could also look for any weaknesses in Megatron's security. Maybe there's a power source that, if disrupted, would open all the doors. Bumblebee could also try to form an alliance with some of the other captives or minions in Megatron's lair who might be disgruntled and want to escape as well.
The Bumblebee Transforming Robot was a series of mechanical building blocks that were first released in 2019. It contained 1124 building block particles and was a Lego building block. In addition, Bumblebee was also a character in a movie. Through this movie, a company called Lesen Robotics quickly gained attention. The Bumblebee Transformation Robot also had related toy products, such as remote-controlled car transformation robots, gesture sensing Transformers Bumblebee robots, and so on. There was no mention of the specific price and evaluation of the Bumblebee transformation robot.
One great Bumblebee and Megatron fanfic could be about their unexpected alliance. Maybe in a universe where they have to team up against a greater threat. They start off distrusting each other but as time goes on, they learn to respect one another's skills.
Bumblebee's fate in the comics is not consistent. Sometimes he dies, but there are also instances where he escapes death and remains a vital character. It all comes down to the particular comic storyline and the creative decisions made.