I use several places for getting bread baking supplies; some local, some online. Here is a list of places I go and what I find there!
Yeast: my local Coop has active yeast – great price, always fresh
Sourdough starter: If you’ve read my previous posts you know how it went! I got my starter from King Arthur Flour. They also carry Fiori de Sicilia.
General bread baking tools: If you have a Sur la Table in your area, pay it a visit! I’ve gotten some nice Silpat mats, brotforms, and bennetons from there. It’s also where I get my panettone collars.
Here are a list of other online sites I use on a regular basis:
San Francisco Baking Institute
Williams-Sonoma (overpriced but sometimes you pay for quality!)
I’d hate to say it, but don’t forget to check out Amazon.com for your baking needs. Their prices are hard to beat!