I have 2 Powerbox Mercury w/ GPS. One is brand new, never been flown. The other has about 20 flights on it. Here is the story, I purchased one and after having it installed in the plane found that it had a bent pin on the monitor cable connection. I needed one fast and didn't want to wait for the repair, so I purchased a second one and installed it. The first was sent back for repair and has never been used. It was mounted in the the airframe. Not a scratch on either one. The new one is $400 the used one $375 plus shipping. If someone wants both, I'll sell them as a package for $750.
Thanks for looking!