It’s not just a Yahoo ad. Brookstone really is selling Marley Coffee, several roasts, online. You can go to the Brookstone site (I tried to link the page to one of the roasts, but it was removed; I think maybe you can't post commercial links under the spam rules). I don’t know about their physical stores, just online.
Did you recently shop for Marley Coffee on the Brookstone site? With Yahoo, you often get ads for things that you recently shopped for on other pages as ads. Right now I'm looking at ads for hard drives from Staples, which I recently looked up.