Oh, I specifically search each album in google. There are sites that provide them. Most are available on torrents. Other specifics songs are in Youtube then I convert them to Mp3 and some are found in Mp3 sites. 

Yes, it’s hard to look for them, I have to dig through the net myself TTw TT and I don’t think it’s in iTunes tho

Oh and thank you so much! Religiously hahahaha~