K6: "A list of all purchased materials, including costs, used in the construction of the robot shall made available if requested by FIRST. At each competition event, teams should be prepared to present a complete materials list/spreadsheet that details the source and cost of each additional component of the robot, if requested."
I have a neat little format for a Bill Of Materials (BOM). If you would like a blank copy, send me a PM and I'll get it to you.
- Katie