For those who like using thin tape to mark rib positions and/or waterlines, I came across an unexpected source for 1/4" tape - a supplier for guitar repairman and guitar makers. They have 2 kinds of 1/4" tape - orange and plain brown. They also sell tape in 3 roll sets (3/4", 1/2", and 1/4"), and sell a special tape dispenser for holding all 3 sizes at once: https://www.stewmac.com/Materials_and_Supplies/Glues_and_Adhesives/Tapes_and_Adhesives/ I haven't ordered from them yet, but will be soon. Their 1/4" tape is much cheaper and much longer (only $3.16 for a 55 yard roll) than the black 1/4" tape I can get locally from a drafting supply store. The 3-roll dispenser is a little pricey though @ $29.35.
I think we still have some left at Strike, and have just taken it off the site. It's a masking tape, I think in 1/4" and 1/8", but I need to check. Let me know if you're interested.