Scrooge McDuck lists a few items on Amazon.com.
A seller has listed a brand new copy of Star Fox Adventures for $999,999,999,996 (excluding shipping and potential taxes) on Amazon.com, which is an approximately 2 trillion percent increase over that games original MSRP of $49.99.

If that copy sells, Amazon.com would receive a 15 percent referral fee of $149,999,999,999.40.
Update (July 16, 2014): An Amazon.com user has claimed he had purchased that trillion dollar copy of Star Fox Adventures!
"Best trillion dollars i[sic] ever spent. This is a monumental game you will not be disappointed in forking over this massive sum of money for this one gamecube[sic] game. I had 3 erections the entire time playing this game it was so good," Kaylyn said in his review.[1]
Sources:
- Amazon.com | Customer Review - Best Trillion Dollars I ever spent
| Kaylyn | July 10, 2014