Better than a heat sink, and allowing unlimited add-on cards, the Smart Fan will keep your Raspberry Pi running when things get hot.
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DIY automation and HVAC system runs Ubuntu Snappy on RPi
Smart Fan for Raspberry Pi
PIco Fan Kit HV3.0 - Pi Modules
TechPowerUp
Canadian source for Raspberry Pi, Arduino, Micro:bit, DIY electronics, robotics, and educational products. Raspberry Pi approved distributor for
Dedicated All-In-One Aluminum Cooler for Raspberry Pi 4B, PWM, with Fan Adapter
SunFounder Ultimate Starter Kit for Raspberry Pi Pico W with Video Courses, 450+ Items, 117 Projects, MicroPython, Piper Make and C/C++ (Compatible with Arduino IDE), Suitable for Beginners Age 8+ : : Electronics
Arduino, micro:bit & Raspberry Pi Products
MULTI-IO HAT for Raspberry Pi Industrial Automation Apps by Sequent Microsystems — Kickstarter
40x40mm fan with 6 cfm airflow Less than 100mA of power Fully stackable allows adding other cards to Raspberry Pi Leaves full use of all GPIO pins
Smart Fan HAT The Best Cooling Solution for Raspberry Pi
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