Pastall 100 PCS (8 Different Sizes) Heatsink Kit with Conductive Adhesive Tape, Aluminum Heat Sinks Cooler and Copper Heat Sink for Raspberry Pi A B B+ 2/3/4/5

So there already a heatsink on it what we been doing is mounting a fan to blow onto the heatsink. You also can get raspberry pi heatsink for the other chips around it which i guess couldn't hurt https://a.co/d/03t8HnDP