Baby video monitors with all the latest bells and whistles cost around $200, sometimes more depending on the feature set. However, you can find solid baby monitors for $100 to $150 less than that, though you'll sacrifice on video resolution and some features. Cloud storage can add to the cost of a baby monitor in the form of an ongoing subscription, though that feature is usually optional.
It really depends on what you feel most comfortable with. There are audio monitors that allow you to listen to any noise coming from the nursery, vital monitors that track sleep and breathing and video monitors that add sight to sound. Babylist parents overwhelmingly choose video monitors. The security of seeing what your child is up to—like if they’ve gotten tangled in their swaddle, pulled their diaper off or climbed out of the crib—can be worth the extra cost of a video monitor.