Before I could afford to buy a second flash gun I used to use a dive slate covered in crinkled Aluminium foil. I used this to help reflect light into the heavy shadows cast by a single flash gun.
I have seen a photographer mount his reflector on a "Bendy arm" (Loc-line) for easier positioning.
http://modularhose.com/merchant2/merchant....ategory_Code=SH
You could possibly laminate the foil these days.
It's worth a try and they are cheap to run!
PauP