I have one of these that I use every so often
http://www.dual-star.com/index2/Equipment/adjustable_mirror1.htm - mainly for offroading so I can still see riding buddies behind me without having an antenna mirror sticking up waiting for a branch to whack it!
I got it from a friend who had 2 and used them as his only mirrors - they work, but not great. You basically look under your arm (have to move your elbow up a little to see behind you.
They work and would choose these over the crappy Dr Enduro ones.