This is what's up for grabs: the empty box, and the adapter. (Shipping can probably be reduced substantially if I roll the box up carefully and put it in a shipping roll.)
This was discussed in greater detail at http://www.digitpress.com/forum/viewtopic.php?t=67448 ; as stated, it allows you to connect a PC-Engine CD-Rom drive to a SuperGrafx.
I of course have no way to test this device and couldn't tell you if it was working.
Any takers? Make with the PMs!