Each group needs:

• 20 feet (6 m) of half-inch PVC pipe cut into eight 18-inch (~45 cm) and four 24-inch (~60 cm) sections (PVC pipes available at hardware stores)
• 8 three-way PVC pipe corner connectors
• 6-8 PVC pipe "snap-T" connectors and/or 90-degree street elbows (for attaching mirrors)
• 6-8 compact mirrors (available at discount, drug or gift stores for ~$1.20 each, example source: CTA https://www.goodybeads.com/store/products/Z003407.htm)
• 1 laser trip sensor alarm kit
• sticky tack (reusable adhesive), 1 package (available in stationery/school supplies section at discount, office supply and drug stores)

For the entire class to share:

• (optional) rubber troll doll (available at toy stores) or make up your own treasure to protect

Note: A US$ 36 per group cost for non-expendable items includes PVC pipe, pipe connectors, 90-degree elbows, and compact mirrors. To reduce costs, groups may share supplies.