How many Nearly Headless Nick Minifigures are there?
There are currently (July 2022) only two Minifigure variants for Nearly Headless Nick, the 308 glow-in-the-dark version that comes with this set, and the 145 version that was introduced in the Great Hall Set 75954. The 308 Chamber of Secrets version retails on the reselling market for nearly double the price of the 145 version, at ~$7.80 compared to ~$4.70.