Dalaran Disc
Sold by Aviana's Request. If you can't find the Dalaran Disc in the purchasable items, make sure you're talking to Jepetto instead of his Clockwork Assistant.
The 
Dalaran Disc is a toy sold by Jepetto Joybuzz in Legion Dalaran for 
100 Gold, and when used, lets you throw a disc to a friendly player who will automatically throw it back.
Guide awaiting review
Find Jepetto Joybuzz
Head to The Wonderworks in Legion Dalaran and locate Jepetto Joybuzz at 44, 45. If you have trouble clicking him, use /target Jepetto Joybuzz and then your interact-with-target keybind, as his Clockwork Assistant often stands on top of him.
Purchase the Dalaran Disc
Buy the Dalaran Disc from Jepetto Joybuzz's shop for 100 Gold. If the Dalaran Disc does not appear in the shop list, you may have accidentally opened his Clockwork Assistant's inventory instead — target Jepetto directly and try again.
Tips
This toy is also available from toy vendors in other cities, such as Blax Bottlerocket in Orgrimmar and Craggle Wobbletop in Stormwind City, if you prefer not to travel to Dalaran.
