Amazon's two days of its 99-cent Lady Gaga album promo were costly but may have paid off in a market share battle with iTunes, both official and unofficial sources said Friday. Music industry contacts said that about 440,000 copies of the pop star's album sold in the two days of the promo, almost all of which were the less extensive but much cheaper sale version. Since Amazon was still paying Universal and Interscope the full $8.39 cut, Billboard estimated that Amazon MP3 took a loss of $3.2 million on all its sales.
