There are some DECENT one and two camera systems out there at close to that price.
Just make sure you get one that has enough IR distance to cover the distance you want. IR is limited but you could purchase a separate IR light to supplement the camera IR if needed.
We're building a house and Ive already purchased 7 of these to put around the perimeter of the house. They are not cheap though and wold need a separate recording device.
http://www.hikvision.com/en/us/Produ...=9125&showid=0