There's another way that I use to power my M2ATX -- and other 12V things -- on wall power. If you have anything with a cigarette plug, chop off the plug and cable, and connect the cable to your M2ATX. Plug the cigarette adapter into this device:
Originally Posted by mightycrown
Some time back, I bought one of the Coleman thermoelectric heating/refrigeration units that keeps food hot or cold, depending on which way you run the power. It came with a 120V to 12V adapter with a socket for a standard lighter plug. Very useful, and it'll run a load up to 5A. Here's the way it looks:
Click on the image to enlarge it.
Coleman sells the adapter alone for about $40 on their site, but they're available elsewhere for $25. Lower-amperage units are even lower cost.