Well, try:
http://www.quickstickers.com/sendfile.php
http://www.allaboutstickers.com/view.php?cat=7
http://www.websticker.com/vinyldecals.htm
As for white tape, any auto parts store (Pep Boys, et al) has many colors
and many widths of tape. White should be no problem.
(I assume it is constant width?)
Dave