I used to get it at Whole Foods and the Trader Joe's here only has Ghirardelli. Chocolate lasts for a long time, so as long as someone is willing to sell to me, I'll buy even if it's a large amount (okay, no bedrooms filled to the ceilings with chocolate 'cause that would be going too far).
I've not heard of those other stores, but I'll give it a shot finding them. Website looks interesting.
Btw, Penzey's Spices is wonderful and I got that tip from here.