A few years back I bought an IBM 5120, then I spent more money
collecting some manuals. Sadly, I've never had the time to do anything
with it, and I don't foresee doing so.
Here is a picture of one and some info, directly from IBM:
http://www-03.ibm.com/ibm/history/exhibits/pc/pc_6.html
Now, this thing weights a ton (>100 lbs), and I don't feel like packing
it and shipping it. It is in Austin, TX.
Although I have about $500 sunk into it, I realize that by not shipping
it my market is dramatically reduced. Therefore, I'll sell it for $250
if you can come and get it.
It boots into BASIC and runs fine. Because I don't have the terminator,
and because the internal floppy disks hang off that bus, they floppies
won't work until you acquire or build a terminator. The machine also
comes with a technical and user manuals, although nothing that isn't
already on bitsavers, I believe. There are also four 8" floppies,
including a diagnostic disk.
Cosmetically it is decent, used but not too yellowed, except for an
unfortunate cracked off corner in the rear, which I still have. Despite
that defect, it is still a functioning unit.