Buying local for something like this is dumb if you are on a budget. You will get raped on prices and selection. Amazon is your friend.

The guy that suggested android phones is out of his element. How are you going to mount the phone securely? You going to have an array of 2-4 android phones? Get something like this if you are on a budget: http://www.amazon.com/Zmodo-PKD-DK4216-500GB-Internet-Accessible-4-Channel/dp/B005FM8UL4/ref=sr_1_1?ie=UTF8&qid=1420300986&sr=8-1&keywords=wireless+camera+system

I have set up a few home and home-office solutions with ZModo. It is shitty software, but you get a full recording rig for 200 bucks.

As someone else stated you probably will not identify them. I sense you are on a budget. How about something like this? I have set this and similar up for a few people too. Works alright. Once an alarm starts squelching most thieves kick it quickly. http://www.amazon.com/GE-Personal-Security-Alarm-Kit/dp/B00032AVN6/ref=sr_1_1?ie=UTF8&qid=1420301364&sr=8-1&keywords=ge+home+alarm