For the cheapest convert, will need a drop bar, 7 speed bar end shifters and brake levers.
Drop bar- $50
Bar Tape- $10
7sp Bar end shifters- $50
Brake levers- $35-$50 (depending; canti or V)
misc cable/housing- $10- $20
You can find the listed components for the prices I listed; obviously you can spend much more.
Last edited by onespeedbiker; 05-01-12 at 11:33 PM.