A power supply to supply what? If you give us a little more information such as output voltage(s) and current(s) and the input voltage, we may be able to help.

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Need to know wattage, inputs (115V or 115V/230V), Outputs. Do you want a switching supply (most likely to find in a low profile) or a linear regulated?

Designed a 3-output linear regulated 1U once. Used a torroid xfmr, and some real short electrolytics.

A 1U height is not an easy task. Many small switchers are not enclosed, so you have to consider clearance to the top, and how to insulate.

Christa,

I recently designed a 1U enclosure and selected the power supply.  The application was a 180-200W supply for Pentium4 motherboard, drives, fans, etc.  Of course, your application may be different, but here's a list of some sources I found:

http://www.sparklepower.com
http://gtweb.net/ps-1u.html
http://www.seventeam.com/st-150sl.html
http://www.rackmountnet.com/ps/emacs/
http://www.tkpower.com/pdf/TK230P0-60-PFC.pdf
http://store.compute-aid.com/cgi-bin/category.cgi?category=search&item=PS300W1U-CW&type=store
http://www.belluspower.com/sp/SPX.htm
http://www.infi-tech.com/PDF/ps200atx.pdf
http://www.maxpoint.com
http://www.pcpowercooling.com/products/power_supplies/highperformance/turbocools/index_hp_1u.htm

We chose a supply from Sparkle, the smallest of the small, and have been happy with it. It's tightly packed, so make sure you don't restrict the airflow to/from it.

ko  (www.ecooling.biz)