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!
I have been looking on ebay. I have never had one before and this is my 4th and most likely last baby. I am going to order one soon though. I think it would be a good investment:)
i got one from w w w. b a b y b e a t . c o m
I cant remember how far along i was with my first when i got it, but i loved it!!! Absolutely loved it.