How much does it cost to book AC/DC?

Excuse me, I'm just curious, but could you perhaps shed some light on the expenses involved in securing the legendary rock band AC/DC for a booking? I understand that they're highly sought-after and their performances are nothing short of spectacular, so I'm wondering if there's a general ballpark figure for what kind of budget one would need to consider when planning such an event. Is there a specific range or perhaps a starting point that I should be aware of? Thank you for your time and any insight you can provide.