Don't really get a clear idea of what you are asking, I assume you mean a window mounted unit.
The answer is... it depends. Not only does the cost of a used window mount air conditioner vary with condition, but also with the BTU rating and its energy efficiency.
A 12500 BTU window mounted air conditioner, in good working order (enough to cool up to a 400 square foot room on a sunny day with average insulation would probably be a fair buy in the neighborhood of 75-140 dollars if it was a fairly recent model. If it is over 5 years old, I wouldn't buy a used one. These things are made cheaply for the most part, they are installed over and over again year after year, if you take care of them they can last a good while, however most people don't get a great deal of time out of them without some sort of issue arising.
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