I suggest if you're going to buy a doppler, you buy a Sonoline B. The other ones on the market really don't work too well.
I use the Sonoline B Pocket Fetal Doppler and it's really loud and easy to hear :) although it's hard to pick up on an accurate heartbeat rate, I usually just record it and count it for myself to be sure. I ordered mine off of eBay for $35 free shipping. You could always go to the direct website which is fetaldoppler.net
I have one... It's a very faint heartbeat sound... Another one may be better. I was a little disappointed in it
I got this from my so's mom but it didn't work for me my last pregnancy...
I have that one and I didn't work :( I was very disappointed