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4x Raspberry Pis (You do not need entire kit or 8GB. 4GB is ideal. Cluster cases usually come with fans and heat sinks.)
CanaKit Raspberry Pi 4 8GB Starter Kit - 8GB RAM
https://www.amazon.com/gp/product/B08956GVXN/ref=ppx_yo_dt_b_asin_image_o01_s00?ie=UTF8&psc=1 -
1x Unmanaged Switch (POE Switch is ideal but more expensive. If using POE switch, can omit power hub and USB cables)
NETGEAR 5-Port Gigabit Ethernet Unmanaged Switch (GS305)
https://www.amazon.com/gp/product/B07S98YLHM/ref=ppx_yo_dt_b_asin_image_o06_s00?ie=UTF8&psc=1 -
4x Ethernet Cables
Cat 6 Ethernet Cable 1 ft
https://www.amazon.com/gp/product/B01IQWGKQ6/ref=ppx_yo_dt_b_asin_image_o02_s00?ie=UTF8&psc=1 -
4x USB 2.0 to USB-C Cables
USB Type C Cable, Pantom [5-Pack 6-Inch] USB 2.0 to USB C
https://www.amazon.com/gp/product/B07MFZM8WZ/ref=ppx_yo_dt_b_asin_image_o04_s00?ie=UTF8&psc=1 -
1x USB Power Hub (Wall charger ok for small workload, make sure power to each port is sufficient)
USB Wall Charger, Anker 60W 6 Port USB Charging Station
https://www.amazon.com/gp/product/B00P936188/ref=ppx_yo_dt_b_asin_image_o04_s00?ie=UTF8&psc=1 -
1x Cluster Case (Not necessary, but gets confusing and very messy without)
iUniker Raspberry Pi 4 Cluster Case
https://www.amazon.com/gp/product/B07CTG5N3V/ref=ppx_yo_dt_b_asin_image_o05_s00?ie=UTF8&psc=1