On a popular internet site is this absolutely gorgeous tooth out of the Hell Creek Formation in North Dakota. The tooth is perfect and the colors are stunning! The problem is that it is being sold as a juvenile T.rex tooth, and it is clearly a Nanotyrannus tooth.
If it were priced at $300, I'd snatch it up in a heartbeat. Description says that it is too robust to be a Nano tooth. . Notice no picture of the base of the tooth is shown in the listing, so it's difficult for one to be 100% certain. Size is only 1.26 inches.