Here’s the link to the Sun Crest current owner’s email:
They also sell Dad’s Rootbeer products (including Bubble Up):
http://www.dadsrootbeer.com/buyonline.php
Alas, the Sun Crest soda is not listed on this page.
I know. I e-mailed them at two or three times a couple years ago, and they simply are not interested in marketing SunCrest any more widely. I’m trying to find out where it is actually sold.