Curiospice at 2265 Mass Ave in Cambridge (near Davis) has gotten lots of local media publicity. I love this store. I found stuff there I never knew existed...included some new-to-me chiles, and I spend lots of time looking for spices and chiles. Amazing custom spice blends as well. Friendly, helpful, knowledgeable staff.
Also I just visited the newly opened Elmendorf Baking Supplies and Cafe at 594 Cambridge St, Cambridge. They have some regional flours (I got some rye), nuts (including hazelnuts), new-to-me baking cookbooks, everything you need for baking, supplies such as a corn grinding device you can use to make your own masa for tortillas from dried corn and even dried lime to slake your dried corn. The owner told me the dried corn they stock is an heirloom variety from Anson Mills in South Carolina and they are looking for a New England source. Very nice people. My son said their chocolate chip cookie was the best he ever had. Coffee, beautiful looking croissants. Very nice people.
For some reason I cannot add a second link so here it is