The Light in the Box website provides a list of cheap outdoor security cameras that includes the Zmodo Outdoor Day Night CCTV Surveillance Security 600TVL CCD Camera and the YanSe 24 LED IR Color CCTV Camera. Multiple VideoSecu security cameras are available from Best Buy in 2015 for under $20.
Yanse, CMOS, Kare and Zmodo all have multiple products on the Light in the Box list of cheap outdoor security cameras. Popular products on the list include the CCTV Security Surveillance Vandalproof 700TV Line Weatherproof Outdoor Dome Camera for $26.99, the Zmodo 4 Bullet Outdoor 700TVL Night Vision CCTV Surveillance Security Camera, and the Color CCTV Camera Waterproof Vision Security 722CC by Yanse. The Best Buy website also has a good collection of inexpensive outdoor security cameras.