i3 4K Thumb Action Camera, Tiny Size, Mount Anywhere, Small Body Camera with Spring Clip, Portable Vlogging, Hands-Free POV Recording, Helmet Cam for Cycling, Motorcycle (with 32G Card, Black)

depends on your defintion of works well (cheaper almost always means more fiddling with it) I have one very similar to this I use when serving papers. Just remember at this price point they're going to be pretty basic and not have motion stabilization or great night vision or anything. Another option is get a dashcam and park with it facing doors, but i find I have to get out and walk around apartments too much for that to be foolproof.