Whistle detector - Part list

LM324: LINK eBay
Electret mic: LINK eBay
Arduino NANO: LINK eBay
10 turn Pot: LINK eBay
Capacitors: LINK eBay
LCD: LINK eBay
Relay: LINK eBay
5V LED strip: LINK eBay
IRFZ44N MOSFET: LINK eBay

You have the full part list above.