You'll know when you find it. Listen for the racehorse.
I bought mine when I was 10 weeks on eBay for $37 and got free priority shipping. It came in 2 days and I was able to find the heartbeat that evening. Since then I can always tell baby's position and see how baby is moving up. I'm 15+3 and baby moves a lot now. My boys enjoy listening to the baby as well!
I ordered 1 a few wks ago on Ebay for 50 euro And got it 2day.. . Yes it does work. I am 16 wks and haven heard my baby's heart beat until 2day it was such peace of mind known everything is all gud in there
i just ordered one today and i got it on Amazon it was 58$
I can't remember the website i got mine from but i spent like 30 bucks on mine and it works just as good as the doctor i think the website was fetaldoppler.com