Check out this affordable WiFi IP camera over at Chinavasion. This plug and play IP camera is built with a 1.3MP 1/3-inch CMOS image sensor, a 3x optical zoom lens, a 90-degree viewing angle lens, a microSD card slot, a LAN port and built-in WiFi 802.11 b/g/n connectivity.
Furthermore, it has 12x 850nm IR LEDs for night vision (up to 10 meters), IR cut filter (w/ auto-switch), Motion Detection function, Mobile Phone Monitor support (Android + iOS) and built-in microphone/speaker (two-way audio function).
Finally, this IP camera can capture 720p HD video @ 25fps in H.264 AVI format. Backed by a 12-month warranty, this WiFi IP Camera will set you back just $52.99 [Product Page]