Let there be light - not

Figured I needed to buy lights for the kids beds.  A simple task one might think.  Alas it would appear not at Big W, Target or K-mart.

The specification is quite simple
Produces light
Clips to bed head
has a switch

Some additional spec's that would be nice
LED - so we can pretend we are green.
Plugs into power - So we don't have to deal with batteries.

These clip on desk lamps are similar to what I am looking for.  Except that desks are horizontal and bead heads are vertical.