HSBLK3 Heatsink, Black Anodized Aluminum, 3.5" x 6.75" - Heatsinks
MakersLED Heatsink Kit
Heat Sink LSI M, Multi/General Purpose, Aluminum Extrusion Type (With Clear Anodized Aluminum) | LSICOOLER | MISUMI
10x IC Heatsinks Aluminum Cooling Fin For CPU LED Raspberry Pi 4 Model B SA | eBay
Raspberry Pi 3 Model B+ Heat Sink | 2 pcs Aluminum + 1 pcs Copper Heatsink for Raspberry Pi 3 Model B plus / 3B / 2B / B+ – Geekworm
Amazon.com: Awxlumv Large Aluminum Heatsink 5.9" x2.71" x 1.41" / 150 x 69 x 36mm Heat Sinks Cooling 27 Fin Radiator for IC Module, PC Computer, Led, PCB : Electronics
Mini Aluminum Heat Sink for Raspberry Pi - 13 x 13 x 3mm : ID 3084 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits