My last note on this subject...
OK, after some more searching, I was able to find this out... I know this isn't J-Pop related per se, but it should be noted for this thread. All this information comes from BOA's official webiste, which is quite good for finding out the latest on this great group:
http://www.boaweb.co.uk
1. "Twilight" is most definitely out-of-print, despite Borders' website still listing it as available for order. In fact, this album is so rare that even the band itself is having trouble scrounging up copies! For those of us in the USA, consider yourself lucky if you own it... apparently only about 1,000 copies were actually shipped here!
2. "Race of a Thousand Camels" seems to be more plentiful, but of course this is a Japanese release and therefore only available at Japanese stores and through the Internet.
3. BOA is preparing a new album and is looking to self-publish, if I'm understanding correctly. That means that there may be more copies of "Twilight" coming... but it appears more likely that they'll make both "Twilight" and the new album available for DL through their website. I'd assume this will be a pay service, though... wait and see...
4. Someone in BOA's forums talked about DLing their songs on Kazaa due to the scarcity of CDs, so I assume if you look hard enough you can probably find them there.
Keep up on the BOA website for more details! I'm psyched to hear they'll be releasing more music soon... happy hunting, everyone!