How much is a mainframe computer?

Excuse me, could you please elaborate on the pricing of a mainframe computer? I understand that these machines are typically used for large-scale computing tasks and require significant investment, but I'm curious to know if there's a general range or estimate of how much one might cost. Are there different models or configurations that can affect the price? Additionally, are there any factors that could potentially increase or decrease the cost of acquiring a mainframe computer? I'd appreciate any insights you can provide.