Aircel is offering the black 8GB iPhone 3GS for an upfront payment of Rs. 9,999 (US $180) and an "advance rental" of Rs. 3,000 (US $55). This advance rental gets you 2GB of 3G data per month for an year or 1000 minutes and 2500 text messages per month for 6 months.
The icing on the cake is that the phones are unlocked, which means you are free to take the phone anywhere in the world, and put in a SIM of your choice. That's right, an unlocked iPhone for a total cost of $235 ($180 + $55).
As a contrast, in the US you can pick-up an iPhone 3GS 8GB for free but with a two-year $39.99 a month contract. That's a whooping $960 over the 24 months, and the device is locked to AT&T for the length of the contract.
Alternatively, you can pick up an unlocked iPhone for an up-front $375 in the US, £319.00 ($498) in the UK, HKD 2,888 ($372) in Hong Kong, A$449 ($465) in Australia or Euro 349 ($424) in Spain. That makes the Aircel iPhone 3GS the cheapest by a wide-margin - $137 or around Rs. 7500.