Haven't heard of any off-the-shelf autonomous quadcopters for surveillance on the market. I don't think it'd be very economical or that useful, honestly. Plus you live in windy country where even light, full-scale, aircraft can't fly some days. And unless you had a small fleet that were rotating through a charging station, you couldn't get more than 20-40 minutes of flight time.
Cameras are likely your best bet. There are lots of cheap digital video recorders available these days, many of which are controllable from your phone. I saw one unit online for $200 for a 4-channel system. Cameras aren't that expensive either. Might cost $1000-$2000 for a complete setup, but that's still cheaper than your drone would be.
Last edited by torriem; 03-27-2017 at 10:46 AM.