Another wave of Gamecube adapters were just released and. . . . . it's gone.

[Sunstrider]

AgentZorn said:
For sure it's scalpers. They know they are in high demand and are trying to make quick buck of the situation.

Nintendo needs to wake up and realize that their strategy to increase demand is frustrating their consumers. If they keep on continuing handling the adapter, and Amiibo, situation like this it's going to hurt their brand.

This would be the definite reason though.