The size of power supplies

[DarkKnight]

Are all power supplies the same size or are there different sizes for different sized cases? If they are different sizes, wheres a good place to buy power supplies for MATX cases?

 

[DACracker]

Yes, many mATX cases take microATX or flexATX (somebody back me up here) PSes. i think the term for mATX PSes is "SFX"... they usually run from 150W to 200W, which doesn't sound like a lot, but it's almost always enough for an mATX board, a P4, and the limited extras that will fit in an mATX case. although I don't have firsthand experience, I've heard that for some reason there is no universal standard size for SFX PSes... which seems strange to me, but eh? I myself am looking for a good vendor for SFX supplies... can anyon ehelp us out?
(try searching for "SFX" on pricewatch.com?)-david