Glad to hear the make headphones for one ear!
I remember in my first year postop going to buy new headphones for my walkman (yeah walkman, dating myself here eh?). I remember clearly if they had ones designed for people who can only hear with one ear, so that you get the full effect unlike wearing only one of the set of two.....needless to say they didn't so flippant young me said to the sales guy "OK then do I get half price on the full set" and then I indicated to the ear phone that would be no use to me and said "you can keep this half"....needless to say they wouldn't go for the half price3, I was still in my angry phase of things so I cussed them out and left the store.
You know I never did use my walkman again! And the only time I use earphones is on a plane!