I have these two development consoles and no idea what they'd be worth. The first is what appears to be either an early KMC unit or a different variation of it. There's a thread about it here. These units and the one willis82 has all came from lots with 64DD dev units, and one feature of the mod is that it doesn't cut off the AV cart lines used by the video capture cart. Note the sticker on this unit is different. It's a bit scuffed up but works fine and includes an exp. pak and has a Japanese cart tray. The second is a common KMC Partner64 V2 console. Normally they're sold with Partner64s but in this case it's just the console on its own. Some scuffs, not as many as the other one, but only contains a jumper pak and has a Japanese cart tray.