If you haven't been picking these up as they're announced, Amazon decided to finally give you a way to get all 25 with one click over at their 25 Days of Free page (amazon.com) - scroll down past the days to find the checkable list and "Buy selected song" button.
Oh, one more thing - if you're GIFTING MP3s, Amazon says that you can get $2 off with the code GIVEMP3S. Details about THAT over here.
I actually heard the song in OFFICE DEPOT of all places! And I believe that, yes, they should thank the WWE, at least in my eyes, because I've never heard of them until the song became Victoria's entrance music.