Yes there are many 25.4 mm road bars. A lot of the older steel ones I believe are 25.4 if you don't mind a bit of extra weight (I used some on my old mountain bike) and they often already have brake levers with them, or you can buy new alloy 25.4 drop bars online and road levers that will also probably fit your existing stem. The only other thing you really need is shifters, if you go with friction shifting you can either use clamp on down tube shifters (I did) or bar end shifters, or even stem shifters. All nice and cheap on ebay, or from a donor bike (if money is a big consideration). I also found that with the road brake levers it helped to lower the yoke on my canti. brakes for a little increased mechanical advantage.