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Some bargain power meters on the Wiggle / CRC ebay site. Think the manufacturers unfortunately went under, however had one of these on my turbo bike and was fine for the price. https://www.ebay.co.uk/itm/156404563537?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=hxX4ImnrT8e&sssrc=4429486&ssuid=AtKJdxuvSpG&var=&widget_ver=artemis&media=COPY