I haven't looked far and wide but the options at McMaster Carr are limited in the small taps, ex. 1-72. I think the real options for the different types of taps start at 2-56. I may have to expand my buying horizon to MSC though.
I do have a tapping fixture from MicroMark which helps with using small taps.
http://www.micromark.com/MICROLUX-TA...TURE,8363.html