It's incredibly hard to find in white these days, and when you do it often goes for silly money. There are alternatives, I use Cat Eye 'Shiny Tape' which often comes up on Ebay in a white/pearl colour. I've not compared the two side-by-side but from what I can tell from photos it's close enough.
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at our shop we've plenty of vintage style Shiny Tape in all colours incl. white, I recommend two packs to get the right feel......can do for £6.00 plus post