Found This and the cheapest I have seen is $119+ price of the strap. Looks like a good deal?
INFO: Tracks distance, pace, heart rate and calories. Instantly share runs and activity tracking progress with friends, family and the world via social media by pairing a compatible device with Garmin Connect Mobile
Activity tracking counts steps and calories and reminds you when it's time to move
Up to 8 hours (small) of battery life with GPS on or 8 weeks (small) in watch/activity tracking mode Garmin Connect