Hi Vivu, sorry for the late response as I did not check this site. The service you are looking for is Fingerprint Card Appointment, not Live Scan. You can click this link:
https://www.identogo.com/services/fingerprint-card
And select one of the 2 options depending on your location. They will scan your fingerprints digitally, and then print them on FD-258 right then. You can mail this FD-258 to get Identity Summary Report.
We're not Green Card holders, and we had no problem getting it done this way.