Indoor security cameras are a great addition to any DIY home security setup and can cost only $30 to $100 (or more) with no ongoing monthly fees. If you have children or pets you want to keep an eye on, or want to ensure no unexpected visitors are lurking in your home while you're away, indoor security cameras are an effective, inexpensive way to do just that. In short, the peace of mind that comes with owning an indoor home security camera can be well worth the initial cost.