RE: Powell's sweet shoppe
It's a rather new franchise, started by a guy actually named Powell.
I visited the original store in Windsor, CA last summer and found it quite fun. They had a huge selection not only of classic, retro and weird items but also some nice imported candies and high-end chocolate bars. Prices are a little higher than you can expect at grocers, but it's certainly nice to find everything in one place.
I stumbled across a second location in Healdsburg.
Here's a list I got from the company of all their locations:
Los Gatos, CA
Walnut Creek, CA
La Jolla, CA
Willow Glen (San Jose), CA
I got my last bunch of Reed's Cinnamon, Root Beer and Butterscotch hard candies last year (very sad that they discontinued those).