We have the ifamily Baby Monitor. Love it! No need to connect to wifi & very inexpensive
I personally loved the Nanit. I definitely waited for it to go on sale though
That said, I have a lot of breathing wear and wraps I could sell you for a decent price if you decide to go with it
I have the owlet dream sock, not sure about the price in comparison to nanit pro, but he sleeps with it on his foot and monitors breathing and heart rate etc. It has a camera with audio that we put over the crib and you can also talk from your phone in the app to the camera.