Okay, so yesterday I went about my way looking for Horns of the Demon. After finding some willing to accept my offer, the finalised deal was:

I gave:
Steel-plated Ninja Band

He gave:
Horns of the Demon
400k

What do you guys think, good trade? I'm thinking that if the price of the Horns goes back up to the price it was at a little while back, I can sell it and buy a Ninja Band for some good profit.