Leuko tape is what my PT uses, it is very strong and lasts along time. you must be careful when using this tape, so that you don't damage your skin. Usually I have to wear it a minimum of 1 day before I take it off, or my skin goes to! You want to avoid getting it wet, or you will have a huge mess! I use nail polish remover or goo gone to remove the glue left behind.
It ranges from $6.99-$13.00, depending on the store's mark up, and can be bought at medi supply stores and my PT even sells it.
Hope this helps.