Amazon has the Xroose Wireless Solar Backup Camera w/ 7" 1080p Monitor on sale for $132 - $32 off with coupon code 3XLDTG33 at checkout = $100 with free shipping.

• Includes 6W solar panel and 10500mAh rechargeable battery. 
• Support up to 4 cameras with loop recording. Comes with 32GB SD card, 
• Features night vision, wide angle recording, and a magnetic mount.