Ditto, the flipped North Roads or albatross bars. No additional expense for brake levers, etc.

A friend did this with his hybrid. With flipped albatross bars he's as aero as anyone riding the hoods or top of drop bars. I have trouble now keeping up with him while riding my mountain bike with riser bars, especially into headwinds.

Between that modification and going clipless his speed over distance is significantly improved the past year.