I got one when I was 16 weeks...I think it's called Angel Sounds off of Ebay (there were many on there) for $40....and I could hear the hb at 16weeks....it was a good buy.
i got one of those cheap ones and when i hit 30 weeks i hear the baby's heartbeat all the time now. It takes a minute to look for it. Now that im 33 weeks it doesnt take much time. I got it when i was 20 weeks, and could find anything! And yes the quality isnt good but if you dont have much money, its a good way to get reassurance.
thanks for your comments ladies! It's nice to hear other's experiences!
health check systems.com is where I got mine. It was about 119.00 and included shipping, works well. I used it through 2 pregnancies, and both my sisters used it through thiers.
I used one and still do sometimes even though I am in my third trimester. I rented one from babybeat.com You can buy one from them as well.
Do not buy a cheap one from babies r us. It's total ****; can't even find my own heartbeat with it. Make sure you buy a monitor that comes with the u/s gel. Others you can only use in the third trimester when they are not very useful and they really do not work well.