The easiest way would probably be to get a pair of wireless cameras and set them up where you need them. The problem with this, however is twofold; for one, those types of cameras are not exactly cheap. Also, 150 ft is pushing it range-wise for 802.11G. If you could find a pair that are 802.11N compliant that should solve the range issue, but the cost is still a factor.
If you can run cables, you could also get a pair of wired cameras. They generally use ethernet and are slightly cheaper, although the cost of the cabling mitigates that somewhat. You'd need high quality cables too, probably shielded CAT 5E to avoid signal degradation over that kind of range.
The cheapest option might be a pair of old fashioned analog CCTV cameras with an A-B switch on the monitor to select between the two feeds. Unfortunately I have no idea exactly what dollar values would be for any of this. I'd suggest stopping by your local electronics stores and pricing out the different types of cameras available.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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