Just three weeks after it began offering a $99 settop box that can stream movies directly to subscribers' TV sets, Netflix said that it had sold out its entire supply. The online video renters said that Roku, the Japanese company that makes the device, will need about two weeks to fulfill current orders and eight weeks to begin fulfilling new ones. "They're selling way better than we thought," Netflix spokesperson Amy Bonetti told the Video Business website. She declined to say how many settop boxes had been sold.