<< In a word, no. I have never seen a place to buy an apple mobo. It's usually seen as a package like you get an integrated PC from Dell or Gateway or (uck!)Packard Bell. You're not going to get one of their mobos without buying a full package or unless you're getting something replaced. >>
the short answer is, no. At some point in time Apple was starting to allow Mac clones to appear but they later changed their minds and now if you want to buy a Mac, you buy an Apple. Actually, I believe you're asking if you can build a Macintosh. To "build an apple" is like saying that you want to build a Compaq, you can't do it.
-Ice