Aavid Thermalloy 5F Heat Sink TO5 45.2°C/W

TO-5-Heatsink-Aavid-Thermalloy-5F-P-Low-cost-push-on-heat-sink-from-Aavid-Thermalloy-that-is-suitable-for-TO-5-package-components-P-Aavid-Thermalloy-5F-Heat-Sink-TO5-45-2-C-W

Price: 4.48 from Rapid Online Rapid Electronics Ltd.