OH man! I AM FEELING PRETTEH COOL!... soz. i won't give away your secret, but i just had to figure it out. Makes me feel like Scooby Doo... 'cept less hungry.
So... 10,401,000 / 27,736 = 375gp each bought for. And 11,066,664 / 27,736 = 399gp sold for. Andybody guess the item given those prices bought and sold for?