Please please help

i am going for shifting in south pondecheri
for 6 months .. for my job

i really need a usb service there

so which is the cheapest & fastest mobile broadband service that can be connected to pc

here are the details : where i have the same requirements that lots of people have
so .. it will be surely helpful for all

needed cost : 400/- to 700/- Rs. per month

speed : mininmum 1MBps upto 2 GB


( not compulsory but will be bonus if ...... at least 512 kb after the limits or 2 GB )

so please please help