I am new here with a new Frontier. I have a steelhorse brand bed extender from my Colorado I just traded. I took it off after doing the deal when I went back home for title to my old truck but didn't have time to take off the brackets from the bed. I then test fitted it to the new Frontier-not wide enough (wait, there is more...). Off to the dealer for a Nissan bed extender! In putting it together, I discovered that the bed extender tubes slide into each other, therefore my original would fit. I like the new one better (fits into track).
So, I have a powdercoat silver, used bed extender sans brackets (available for $15 here: http://www.autopartswarehouse.com/details/QQUnivQQBestopQQBed_Extender_Hardware_KitQQD347460401
It is very functional, just not new (a few scratches here and there). I can fully break it down to fit it into a box ~2x2x1ft for shipping with an est wt of 10-12lbs. My zip is 65807.
$50 plus actual shipping.