Trade new Polar S2 speed sensor \ transmitter for cadence sensor

I have 2 extra speed sensors and I only need one as a spare so I will
trade a new one (I only used it to test range, where it worked
perfectly from the rear chainstay) for a cadence sensor in any
condition as long as it functions correctly with a newish battery and
is not cracked. I will even consider a first generation (squarish with
a steel "U" mount) sensor as long as it meets the above criteria. If
you have something else of comparable value I will consider that also.
I simply prefer to have one spare of each so I don't have to move them
around when I need to change a battery.

Email me if interested. I will cross-ship if I am familiar with you
from here or RBR.