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If you have some old smartphones lying around you can turn them into security cameras. Theres an app WardenCam that's free has 40 hours free trial, then I think it's only 9.99 (could be wrong, it might be cheaper). You just set the phone up and open the app. It will start recording as soon as it sense motion. If your on wifi you can watch in real time, if not it will record. It also does sound, but it's not the greatest unless it's really close. I've found it pretty useful.
Here is one I used, [link]
How about an old phone and WardenCam. No subscription and it uploads the videos to dropbox automatically.