Stuffed animals that record heartbeats?

So a woman I know just got a stuffed animal that lets you record the baby's heartbeat and then will play back the heartbeat whenever you squeeze the stuffed animal. I want one desperately but she got hers from a 4D ultrasound place and the place I go to doesn't offer them. I have found places to order them online but I was wondering if anyone on here has ordered one and was happy with the results, and could give me the link to the website they used, so I don't give my credit card info to a bad website.