my school has this ghetto "grade sheet" thats just a chart you fill in. I think they do it b/c the official transcripts cant upload on line. a few firms I had interviews wanted a transcript ahead of time via e-mail and said it was no problem if I e-mailed them the unofficial grade chart I had. HOwever, I did bring an official copy to each interview and made sure that the firms I had e-mailed the chart to got an official copy of my transcript just b/c it looks so much nicer.
that said, most of them were like "oh we didnt even need an official one, a photocopy/unofficial is more then enouth" and they were all really nice about it.