How much is a stronghold key in DMZ?

Excuse me, I'm curious about the current value of a stronghold key in the DMZ market. Could you please provide me with an estimate or an idea of its range? It's quite crucial for me to understand the pricing dynamics of this particular item in the cryptocurrency and financial realm we're operating in. I'm hoping to get a clear idea of how much I should be prepared to spend or potentially earn if I were to acquire or sell one. Thank you for your time and assistance.