There is someone on the board from Pakistan called scruples. You will find him if you go through some recent posts. He's got a bright green granny smith apple for his picture.
I know that one shot can be $500 ( I was quoted about $400/shot in Bangkok in 2006) . The pharmaceutical companies will supply it free to those in need in the US with a doctors prescription.
Roche and Scherring-Plough have a monopoly on production of interferon.
Good luck