I think that Nikon puts a 90 day warranty on refurbs. Take it and shoot the heck out of it before the 90 days are up, to make sure there are no issues. Really, though, what's the difference in getting a refurb and buying a used scope? Nikon's warranty doesn't transfer as far as I know, and $75 IS a very nice price for any Nikon scope.
As for the Bargain Cave, I have become lost in there many times myself, and have had to buy my way out....to the wifes displeasure.