What should I sell it for? If you want one tell me.

Look it up on the shop search to price you items.

commerce>> search shops

I think I all ready cheked that and no one was selling one.

Someone is now.For around 40k its not a that rare of an item.

The black candy bar is a glitched item in the shop search, so it may not always appear.

Is this something that happened recently?

It's been known for a while, actually.