Yeah, I really don't get how a video monitor gets you much more than just an audio...if something sounds odd on the audio, I'd probably want to got check even if I had video.
JUst Google Video Baby Monitor....I found load of them for $179-229...not a lot cheaper but a little bit. Personally I'd rather spend money to get the best audio quality and a poor quality cheaper monitor, nothing drive me crazier than a noisy baby monitor