They come 3 different ways - 1) the Garmin with a HR monitor and a speed/cadence monitor 2) the Garmin with the speed/cadence monitor and 3) the Garmin with the HR monitor.
The Garmin is the same in all 3 packages, just the accessories are different. If you get the one that only has the speed/cadence monitor you can add a HR monitor later.
I just looked on Amazon and it looks like the one that has a $379 list price (but is actually cheaper than the other one!) does not have the speed/cadence sensor. If you scroll through the description part there is a small section 'What is in the box' that will help. They do not make it clear at all.





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