Event on THUNK

Squashed behind this big rock, you see a shiny bright tent. A small fire burns outside, so you politely knock (or whatever it is you do on tent flaps) and a small man emerges. "Interested in the Artifact?" he squeaks. "Artifact?" you ask. "Yes, but its in three pieces, and only me and my buddies know how to get to them." "How much?" you ask.