If you have been keeping up with my blog posts, you'll know that I enjoy the 3M ATG 700 Adhesive Gun. It is easy to use because it can easily be "removed" by rubbing off the paper, much like rubber cement. You can roll little glue dots with it and it is virtually invisible under vellum paper (over white paper).
The refills are economical since it is 36 yards (108 feet/1250 inches) for about $4 US. It's available on http://www.denamidesign.com/
I created a video showing how to load the ATG gun.
Click here is you have trouble viewing here