I was thinking of making my own window drapery in a style known as "roman blinds". Was wondering where to purchase the needed hardware? Such as pull string roller and locking mechanism.

Thanks!
Knucklez

Once you have made your Roman blinds you will need to fit them.

Here is a useful guide:

247 Blinds - Buy Roller Blinds, Vertical, Venetian, Wooden Blinds

Hope this helps:D

Check with any suppliers of window treatments or curtains rods suppliers. Also check with hardware stores.
Somehow, this website can help you with useful informations bamboo roman blinds and other stuff related to window treatments.
Bamboo Roman Shades website