I got mine off ebay. It's a Sonotrax - Fetal Pocket Doppler. It's 3 Mhz, has a loudspeaker and digital screen that shows the heartrate and you have to use the gel with it. I paid $100 for it. It says that you can hear the heartbeat as early as 10 weeks, I didn't get mine until 12 weeks, but heard the heartbeat that day. I really, really like having it! I wish I had it for my first pregnancy!
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