I have a couple of mirrors for use when doors are off:
Harley Davidson Long Stem Mirror (black) -- it was discussed in this thread
Only used a few times, still have the box it came in.
I also have a pair of "Pilot Eurosport" mirrors which go for about $20 at the local auto store. Google the model (MI-024) to see pics.
All 3 mirrors for $25 +shipping from 08515