elvatrdude
One can never have too many hobbies.....
I was able to locate a source for UV stable white acrylic tubing. It comes in 6' lengths and the 4"dia runs $30US per foot. For an extra 15% charge they will cut to length. Here's the link:
http://www.sdplastics.com/castacrylictubewhiteandblack.html
http://www.sdplastics.com/castacrylictubewhiteandblack.html