I need an outdoor security camera to watch my back yard?

I'm looking for something that's less than $150, that will monitor my back yard, ideally something wireless. I would like something that can stream to a computer, so wireless b/g is needed. Also, I would prefer something that was able to take decent images at dusk, because one of the concerns I have are deer eating at my garden. I don't want to have to buy a 24hr VCR, or any other equipment, but streaming to a hard drive is no issue.

If possible I'd like something that was motion activated, so that I don't have to sit through 12 hours of video every time a deer eats something.

Also, any software recommendations for this would be appreciated.

I need an outdoor security camera to watch my back yard?panda

Anything at/below the $150 price point (and even higher) is going to have near-nonexistent low-light performance.

Lumenera makes good quality network security cameras, but they are not cheap. Most of their models are for wired ethernet though.