Dopplers for baby heartbeat!

Abbigail • Married and expecting a little boy on May 16th, 2016!! 💙😍 we love him so much already!
Has anyone bought any of these? Because I didn't even think you could be i googled it just cause and you actually can have your own baby heart monitor at home. And they aren't expensive at all. I'm probably going to figure out what the best one is and buy it! What do you ladies think? Has anyone heard anything about these?