Industry sources believe that Apple's G4 Cube's days are numbered.

According to ZDNet and CNet, the Cube is unavailable from US distributors, though it's still putting in an appearance on Apple's online store.

Despite an award-winning design – the Cube has won prizes from BusinessWeek and the D&AD - sales of the product have been poor.

Apple expected the Cube, launched in July last year, to sell three times the amount that it has done. The company has slashed the price of the Cube twice this year.

Earlier this year, Apple's CEO Steve Jobs told financial analysts that Apple had misjudged the market. He said: "The disappointment for us was that the market was not as big as we thought."