Maybe you should try buying the CDs because you might like the rest of the songs?
I never understood buying single songs. Albums are created to be listened to as such.
Just download them off P2P. Or you could pay for them at allofmp3.com but that probably is just as illegal as P2P, so you may as well get it for free. Though allofmp3.com gives you a free sample song, so you may want to check them out.