My small homeLab for tests:
5 x RPI 4B 4Gb RAM with copper heatsinks and fans
5 x USB-A to USB-C cables
5 x Ethernet patch-cords
1 x Rack for 5 RPI's
1 x USB Charger for 8 USB-A Ports
1 x TPLink TL-SG108 Switch

Note: SD Cards not included!