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I bought this, took 1.5 weeks to get delivered but works as well as garmin: http://www.aliexpress.com/item/High-Quality-1set-Wireless-Sport-Sensor-Chest-Strap-2-4G-ANT-Heart-Rate-Monitor-Smart-Belt/32471759364.html
garmin HRM unit seems to be malfunctioning.
I took it apart and replaced the battery and it still doesn't last longer than 20 minutes before it cuts out.
I miss having HR zones to guide my efforts up hills etc.
Are there cheap replacement units to be had?