I recently went to a little shop that sells industrial machines and supplies and was happy to see masking tapes on the shelf in many colors and sizes.
I have been searching high and low for 1/4 inch tape so that I could sew zippers by using the tape as a guideline for each side of the zipper seam. I found some at an artist supply but it cost almost 10 dollars which I happily paid since I was tired of looking for something that did not seem to exist.
The tape at the little shop came in a variety of colors and I thought about how helpful it would be do use it while draping on my dressform to set the style lines as well as using for zippers.
The best part is the cost - 1 dollar for 1/4 inch and 2 dollars for 1/2inch.