I am about to put up for sale a Celestron ED 2 inch 2 x barlow. $120 including registered post & well packaged. Cost me $175 new.
The ED barlows are of better quality as they show less chromatic aberrations.
One of the screws has been replaced as I dropped the screw and it got lost in the grass. So there is one different looking screw on it, but not very noticeable and has no bearing whatsoever on the function of the barlow.
The ad. will be going up in the classifieds in the next couple of days, so let me know asap if you're interested.