As shown on the page linked below, I own copy #25 of Mental Kombat, an excellent Atari 2600 homebrew cartridge that included "labeled, numbered, signed, boxed cartridge with instructions, two headbands and the Hozer Video Games-button."
http://www.quernhorst.de/atari/owners.html
The link to the AtariAge database entry for this title can be found below. As you will see, the cartridge and box are very attractive.
http://www.atariage.com/software_page.html...areLabelID=2354
I paid $49 plus shipping (from Europe) for this game. I am currently taking offers to sell it.
Thank you!
(This is the AA box scan, not an actual scan of my copy. Mine is MINT as well.)