I doubt anyone carries 20 in stock...they would normally be special order. Unless you possibly have a distributor nearby, who would sell to the public, I think S/O is what you'll wind up doing. Any Home Center or door seller can order them. Prob around $80 each as I remember...it's been a while, I may be thinking of prehung. Oh...are they flat or paneled? Wood or Masonite?

The problem with driving a 3 screw through the hinge is that it may come out the jamb of the sidelight that is next to the door. (or hit the glass, breaking it!) Doors between sidelights can be a real pain to keep square. Use the longest screw that you can, without it coming through the sidelight jamb... do some careful measuring- it might be a 2 or a 2 1/2. The idea, like Larry said, is to pull that hinge tighter to the right, which will help raise the door, pulling it to the right. Place the screw in one of the two holes that is closest to the weatherstripping, not one of the two holes that is closest to the hinge pin. You remove the short screws and replace them with a longer screw. 1 screw is good, two screws is better. If the door has no shims around the perimeter, (a lot of people think you can just nail a door to the rough opening by using the exterior trim like a nailing fin) you could also remove the exterior trim, which would free up the door. Then insert shims around the perimeter of the door, especially behind the hinges. Use a 80 level to keep each side straight and plumb. You could square the door up this way, if the screws in the hinge don't help. It also looks to me like the door may be out of level, and could benefit from placing a thin 1/8 shim underneath the bottom right side of the door, directly under the base of the jamb.

Door