I recently ordered a Nashbar Tempo Double Wireless cadence monitor, but realized that I mistakenly ordered 2 of them, so now I have an extra sealed box sitting here. It cost me approx $48. Full disclosure: It's intended for a DF bike, and will not cover all functions when installed on a trike. You can have either cadence monitoring, or all the other functions, but evidently not both. That's fine with me, since I only bought it for the cadence function.
Anybody want the other one? What am I offered? I'll cover the shipping.