I'm asking this question on behalf of a friend and professor.  We're
opening up a Little Theatre at our school and we'd like (in her words)
"an authentic, not home made but real, theatre ghost light."  

A ghost light (again her words) is "usually on a stand, maybe wrought iron or
something, usually have 3 legs or feet, and roll [on wheels].  The top
is usually a plain light bulb, sometimes with a wire cover.  The
electric cord usually comes out of the light fixture part."

This is to be used in a real theatre, so something high quality and
authentic is preferred.  I need to be able to have it purchased,
shipped and arrive by the 27th of September.

For those who are not familiar with the tradition of a "ghost light,"
here's an interesting article:

http://www.suburbanchicagonews.com/beaconnews/features/AU26_OUTTHERE_S3.htm

Thanks, Pinky, I did indeed wonder what this was about, and wonder
when the tradition started, and what they did before electricity,
wondering further if it dates back to passion plays in churches (good
place for ghosts) and could even be related to the light on the
tabernacle in Catholic churches.

Anyway ...

Ivyelmire-ga, what you need is a "light stand".  Search with the
expression and you will find quite a few.  If your colleague insists
that it must have wheels, it may be more expensive.  The stand can be
purchased without a light fixture, something that could be simpler for
just a light bulb.  I don't expect that any ghosts in a brand new
theater will be so experienced that they will take umbrage at an
amateur solution

Here is one site:

http://www.tallyns.com/Aurora/AuroraStands.htm

Scroll down to the one with wheels, if that is a must.

"break a leg", Myoarin