Each group needs:

• Sharp^® GP2Y0A02YK0F Sensor, for $14.50, available from Acroname Robotics at http://www.acroname.com/robotics/parts/R144-GP2Y0A02YK.html
• 4 AA battery holder with cover and switch, for $2, available from Pitsco Education at https://www.pitsco.com/AA-Battery-Holders-with-Cover-and-Switch?SKU=32971&
• 4 AA alkaline batteries, for $2 per pair, available from Pitsco Education at https://www.pitsco.com/Batteries?SKU=51046&
• mini multimeter, for $24, available from Pitsco Education at https://www.pitsco.com/Mini-Multimeter?SKU=31912&
• 2 #4-40 x 3/4 screws, such as product #1170 for 12¢, with 2 combo hex nuts, available from Bolt Depot at https://www.boltdepot.com/Product-Details.aspx?product=1170; also available for 7¢ from Bolt Depot at https://www.boltdepot.com/Product-Details.aspx?Units=US&Category=Nuts&Subcategory=Hex_machine_screw_nuts&Material=Brass&Plating=&Grade=&Finish=&Thread_direction=Right_hand&Thread_density=Coarse&Diameter=%234&Thread_count=40&nv=rel
• 2 wire connectors, such as a 25-pack, available from Lowes at https://www.lowes.com/pd/IDEAL-25-Pack-Plastic-Wing-Wire-Connectors/1000138283
• alligator clips, such as from Lowes at https://www.lowes.com/pd/Utilitech-16-Count-Disconnects-Wire-Connectors/999953182
• 2 clear suction hooks, available from Home Depot at https://www.homedepot.com/p/OOK-2-Pack-Press-Mount-Suction-Cup-533897/206177685
• precision screwdriver, for $9 per set, available from Lowes at https://www.lowes.com/pd/IRWIN-Precision-5-Piece-Screwdriver-Set/1000234943
• zip lock bag or plastic produce bag, to organize group materials as a "kit"

To share with the entire class:

• screw eyes, for $3.50 per box of 100, available from Pitsco Education at https://www.pitsco.com/Standard-Screw-Eyes?SKU=15109&
• masking tape
• ruler
• fishing line or string, for a finishing line