I have never tried walkie talkies! I was looking at my DS's toy ones yesterday thinking, "Surely you could use these as baby monitors?", but then I realised you have to keep the "Talk" button pressed at all times in baby's room for that to work . I've not heard of ones that come with baby mode.

What brands of monitors have you tried? I have a Philips monitor and it is by far the best one I've tried when it comes to interference.