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I used one of those $30 TV's for a project when I was working. (Monochrome camera sealed inside a pond light for viewing things inside water tanks without having to empty them). The TV worked very well in dim light, would be good in the dark. Not much use in daylight, eg solar observing. They can be powered from internal batteries, car power socket or 240/12v plug pack.
If you only want it for observing, would be a cheap option.
Bill
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