If you are talking single drill w/ low mileage, I would say $75-$100 plus shipping is pretty close. If it is a discontinued, hard-to-find Saw, it may go for more.
A good way to get an idea is to check out eBay and see how the auctions are ending; that will give you an idea on the fair market value.
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~SprayNpray
-formerly known as SawFreak