Cheaper garmin 500 cadence sensor

Have any garmin 500 owners found a cheaper cadence sensor that will work with the 500.I got the bundle and put the
one in the pack on the best bike,so looking for one for the other bike.
Failing that any recomendations to get the garmin one cheap.
cheers.
one in the pack on the best bike,so looking for one for the other bike.
Failing that any recomendations to get the garmin one cheap.
cheers.
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I use the Decathlon one with my Edge 500 - works fine.
I have also had 2 GSC-10s die on me so not a fan of them either: fragile reed sensor in speed arm breaks after a while. Would never buy another.
The best of those I've had is the Motorola Activ one, which appears identical to the Bontrager Interchange speed/cadence sensor. It's a one piece unit like the GSC-10 but attaches with a rubber o-ring affair instead of cable ties so it's easy to swap between bikes. Seems to be more reliable than the Garmin ones and neater than the Decathlon one.