Alison Rose says speed right over to the Lindt Chocolate Store at Burlington Square on Middlesex Turnpike (NOT the one in the mall), which is having a clearance:

It's a chocolate sale, people--what more do I have to say?

Lynne says Clear Flour Bread in Brookline has chocolate croissants that are almost as good as the ones she remembers from Aix-en-Provence:

... One step inside and you'll be smitten. There are breads of every size and shape (braided, baguettes, country loaves, etc.) as well as tarts, cookies, sticky buns and other guilty pleasures. It is the closest thing that I have seen to the types of bakeries you see in France on practically every corner (those people know how to live). ...