Newegg offers the Edimax 720p HD Wireless Day/Night IP Camera, model no. IC-3140W, for $64.99 with free shipping. That's the lowest total price we could find by $37. It features motion detection, night vision, microSDHC slot, WiFi, ethernet, and iOS, PC, and Android viewing software.

Alternatively, if you haven't yet, use Newegg’s Android app and pay using Google Wallet to yield a final price of $49.99. (This discount can only be used once per account.)