1) Where can I get 1" wide streamer?
http://www.hattrickrc.com/streamer.html

2) Is there an easier way to cut down the wide stuff instead of using scissors?
Put the roll in the freezer for a couple hours, then cut it in half on a band saw. Watch your fingers because it cat catch and grab with course tooth blades.

3) At a contest do the flyers provide their own streamers?
Not usually. By RCCA rules, the CD supplies the streamers.

HTH,
D