I have had this tower extension for some time now and am looking to get rid of the stuff I haven't put to use. It is used, and has light surface scratches around it, a couple of dings on the top and the flared opening, but overall it is good condition. I am looking for 10 bucks plus shipping. It comes with a curved yellow washer and a nut, to attach your shank and faucet of choice.
Also I just checked and this seems to fit in a small padded envelope and can go first class mail, so it shouldn't cost more than 4-5 bucks to ship. I'll get a quote before of course to let you know.