Country star Garth Brooks' comeback is complete - America's WalMart chain has shipped one million copies of his new limited edition box set in just two weeks.

The retired singer's remarkable figures won't feature on US album charts because Brooks chose to release the package as a single-outlet exclusive item, and therefore he wasn't eligible for chart recognition.

The low-priced box set includes four previously released CDs, featuring his new hit GOOD RIDE COWBOY - a tribute to late rodeo star CHRIS LeDOUX.