Video Door Bell on Special

Hi All,

I am looking for wired Video Door bell and can't seem to get much bargain under $100 except in bunnings

http://www.bunnings.com.au/orion-10cm-lcd-monitor-video-door…

I was hoping to get the wirelss ones but I hear most interferes with other wifi network /mobile phones/ cordless devices.

Can someone recommend me a cheaper solution than what bunnings are offering ? If I could get a wired video door bell but the video gets relayed into cordless device that would be great.

I would then have the benefit of taking the cordless device upstairs and if someone buzzes me I could see and talk to them instead of running downstairs all the time.