I want to know, where in a STORE can I buy Canfield's Diet Chocolate
Fudge Soda near Palo Alto, California (Zip=94306). I know I can buy
online, but shipping makes the deal too expensive. Anywhere within a
25 mile radius would be okay. Alternate but similar products
(noncaloric, soda, chocolate) would be okay too, if they exist. I love
this stuff, and became addicted on a recent trip to Florida.

You might try the following retail stores that specialize in low carb foods.

http://www.e-clipse.com/retail_california.htm
LOW CARB Retail Stores: CALIFORNIA

This was a long time ago, and so may or may not be helpful, but I
believe that when I had purchased Canfield's in the past, it was at
what was then the Lucky store at Alma Plaza.  Perhaps that location
(now Albertson's, as of last I knew, though I've since moved from Palo
Alto) still carries it, or could be asked to?

Anyway, here's hoping that might be helpful...