I was told just last week a production mold for an automotive bumper costs about a million $. Mind you, that is a big mold with hot runners, multiple gates, and I think some moving parts. I can't confirm that figure but I do know a small mold for a 4x12 inch rectangular plaque, 3 mm thick, costs $10k. Uh, but that is not from China.

Depending on how large and complex the mold is, the price does go up a lot.

However, for a 2-up mold for something the size of a game controller, with a 0.5mil shot life, with maybe a slider or two, you are looking at $8-10k at many of the molders I've worked with.