Earlier this month Essar Group snapped up ailing BPL for $1 billion. Today, Tata-Birla combo bought out Cingular’s 33% stake in Idea Cellular for $400 million. Idea is India’s fifth largest mobile service provider with a subscriber base of 5.7 million. That puts the value at $210 per subscriber … a bargain even if the average ARPU in India is around $12 a month. In comparison Essar paid about $370 a subscriber.