Thanks for the information "ghpk". How about those china made gprs enabled mobile phones. they too serve the purpose. don't they ? hope to get them cheap for the time being, atleast till I migrate to 3g or wimax later on.
frankly speaking, you'll have hard time with configuring them. also most such mobile would be non-3G
so why to invest money on it.
if you need non-3G usb modem, a second hand would be 700-800 and best would be to go for 3G enabled one so you don't need to buy it again and again.
check with local store in your town, i am sure they could arrange.