Buy a Huawei (IDEA Branded) E1732 on ebay.
Huawei E1732 3G usb modem Data Card 7.2Mbps Unlocked Idea Net Setter | eBay
The above link is from one of the best ebay sellers (data Cards only), Blue Dart Shipping, 1 year warranty.
Plus this card has MicroSD slot, external antenna slot as well as...