Ant+ Cadence sensor

I am after a cheap Ant+ Cadence sensor to put on my old bike when I move my Garmin one onto my new bike. Since moving it back and forth is a task I really cannot be bothered doing I would rather just get a second one so I can just move the Garmin from bike to bike without losing the capability. Anyone know of what, where and how much I can pick one up for? So long as its Ant+ I dont care which make.
Cheers.
Cheers.
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Large bloke getting smaller :-)
Not sure what the wire is for on the decathalon link?
Paul.
Large bloke getting smaller :-)
OK, I thought it was just cadence.