Are they usually hard to find? And are they desirable? (questions, questions...)

I've got a few... Are you talking about the one-track versions? I've picked them up cheaply enough, more as investments than anything, but ultimately they are just one-track cds to me.

 

Both Clocks and The Scientist had edited versions on the promos if you are completist.

 

The Clocks remix 12" is rare but musically shite, whereas Mince Spies is rarer again, but very cool.

I've found one-track In My Place. It has a sticker on it though in Swedish. :/