Wayne,
You can get Rapidograph pens at drafting or arts stores. I also think Office Depot has them.
Ty,
If you want to get tight, try inking a drawing and then doing the Leroy lettering. Recently I started to do some Leroy lettering and wondered how I ever had the patience to do it. I have been spoiled by CAD, it sure is easier to type the dimensioning, notes, etc.