JAMECO might not be the best place to look, I found more options at Digikey, but either too expensive or too big. I don't mind harvesting a PSU board from a CPU PSU, I am just unsure if it makes sense given my earlier questions; at least cost-wise it is attractive. Even the bare PSU's from JAMECO will have forced air cooled/convective cooled ratings. Here is a PSU I thought looked interesting, but it only has one 12V rail even though the nameplate has an A & B listed for 12V:

SeaSonic SS-300TFX

http://www.hardwaresecrets.com/article/Seasonic-SS-300TFX-Power-Supply-Review/1021/2

and on power distribution (rails): http://www.hardwaresecrets.com/article/Seasonic-SS-300TFX-Power-Supply-Review/1021/6