Use the Arcanite Buoy at the Swirling Maelstrom at the Bay of Storms in Azshara.
Champion, The Blue Dragonflight believes that you are fated for greater things than even I could predict. Despite what some would have you believe, our world needs heroes. In your darkest hour, when you face the blight of Kalimdor, recall the epic journies, trials, and tribulations that you undertook for an old gnome and let those memories lift your spirits. Humbly, Narain Soothfancy P.S. Sorry about the repair costs.
Part 2 of 2 in this series
Did I mention the bad news yet? Its name is Maws: 100 feet of death and destruction. I guess I may have forgotten that little tidbit. According to my superior psycho-psionic clairvoyance, you'll find that the best spot to cast this buoy is off the coast of Azshara, in the Bay of Storms. Look for a swirling maelstrom, most likely cluttered with wreckage. By the by, I hope you have friends. Now if you somehow miraculously succeed, take the scepter shard to Anachronos.
Time is running out, champion.
Well done, Hero. I will be able to reform the Scepter of the Shifting Sands soon.
!?