I go through earphones like drunkenbeagle and trips to the bathroom when he's eating Mexican food. Largely because of sweat, I guess.
I need a good seat of earphones, preferably the 'wire behind the ear' variety with foam earpieces and some bass (I'm black, I gotta have that dirty bass).
Why not just steal them from the seat backs of that 767 on your next trip? Wipe out a whole section of economy and you'll be good for a few weeks. Sure they're crap, but they're freeeeeeeeeeee