Singlespeed or fixed? A lot of us have spare parts we could, uh, part with. I've got some nice Shimano non-aero levers you could have if you want.
I've also got a right Suntour GPX lever I'm not using at the moment (using the left one on my fixie), I don't know if I want to hang on to the right one and use them as a pair again later on, but I might be willing to trade them for bullhorn brake levers if you've got some laying around.