Share 'Small quantities--sign painter's tape, 3M Stickit Gold'

I'm about to fit a new bridge to an archtop guitar.  Dan Earlewine has a good StewMac trade secrets column on how to do it with a Stew Mac bridge fitting jig, but he uses sign painter's tape and 3M Stickit Gold paper.  I'd like to find a source for small quantities of either, since I don't do that much guitar work and probably would never use whole rolls of either sandpaper grit or the tape.  Doe…