Where can I purchase whit or clear straws for stacking cakes. I cannot find anything but colors.

idk -- i never tried to find a certain color -- i usually go for the brights or stripes 'cause i like the happy coloration -- never thought about that -- colored ones are easier to fish out --

interesting question -- and i have no clue

Amazon

https://www.amazon.com/100-Wide-Smoothie-Bubble-Straws/dp/B008WNHDKW/ref=sr_1_1?ie=UTF8&qid=1473447047&sr=8-1&keywords=clear+bubble+straws

I agree with K8.  The colored straws are much easier to find when deconstructing and cutting the cake.  I have some clear ones with colored stripes on them and they're pretty visible, as well. 

I just like the white or clear for wedding cake. They look better.

Who sees the straws others than the caterer and kitchen staff portioning the cake in the kitchen? Or is there some design that exposes them?

No, johnson, if anyone other than the cake cutters are seeing those straws, there are bigger problems to worry about than the color!!!

@maybenot....OK, just wanted to be sure I wasn't missing some great detail. I agree that bright colors help locate them when the time comes to cut the cake. :) 

hmm, over the years with the greater and greater degrees of cake nakedness ranging from bare naked plain smooth icing to icing scraped cakes to bare naked cakies -- I hope exposed naked dowels is not the next craze!