Okay now, here's a rare cart I couldn't even find any info about online, and which to my knowledge has never been dumped to a rom image...
World of Warcraft for Famicom. I'm not even kidding. This is an original Chinese RPG that looks somewhat similar to the infamous Final Fantasy VII for Famicom and may be built around the same engine. This is certainly not a hack of anything, but an actual original game. It seems to be a traditional old-school RPG, though I haven't played through it - all I did was pop the cart in and take some quick pics for you guys.
The cart comes complete with clamshell case and full-color manual, and
is essentially new (like I said, I just popped it in to take a few pics).

Let me blab about the gameplay a little bit. Sorry for the crappy pics. As I said, I couldn't find a ROM, so these were taken off a TV.

This is the title screen. Choose "new game" on the left and you end up here...

You are the little purple guy. The winged dude explains a bunch of stuff to you (doubtless highly important crap about your mission being to take out all the evil wizards or something), and then you launch into a battle sequence.

This is what the battle sequences look like. Keep choosing "attack" (upper left) and slog your way through a bunch of goons. Eventually an especially powerful monster shows up and takes you out in one hit. Then you are transported to a castle.

At this point the game becomes something that appears to be very similar to an old-school RPG.
I haven't played any further than that. I leave it to you to continue the adventure and report back here about what you find.
I should probably say that although I'm fairly new on NA, I've been on eBay for about 11 years now
(yikes!) and have a bunch of feedback there (
see here).
If you have any concerns about this actually being me, you can send me
a message through my eBay account, leave me your username on NA, and
I'll respond to you via PM.
I wanna point out that the overall
manufacturing quality of this thing is not up to US or Japanese
standards. There's nothing wrong with it in particular, but for example
you can tell that the paper quality on the manual isn't great. I'm only
mentioning this for super anal collectors (because I understand).
I'll ship this for $3 in the US or Canada, $7 anywhere else.
Happy bidding!