If size is not an issue you can get a single PC power supply for around
$(NZ)40 (13 pounds sterling) which amongst other voltages provide much
more than 0.5A@12V but typically have a switch on the back for 110V or
220-240V. Beware though because some supplies do have a minimum 12V load
specified.

If you are looking for 50 at a time the cost should be less because I am
just getting prices from a retail website.

Steve

Richard Burgess wrote:
Sorry, in the UK!

"loedown" wrote in message ...

where in the world are you?

Paul