Here is a link to an article saying what the props from classic shows are going for. http://www.metv.com/stories/15-props-from-classic-tv-shows-you-can-buy-right-now I am rather skeptical about these sorts of things. The Bewitched prop is supposed to be Samantha's colander. I don't recall ever seeing Samantha use it, but I could be wrong. What surprised me is it is the exact same one my mother had when I was a kid.
With the exception of the Gunsmoke script, most of those items can be found in most thrift stores or at yard sales. I cannot justify spending that type of money for something that may or may not have been on a television set.