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I had my EAD done in Boston. As far as you live in MA area, just walk in to Boston office. They open early morning 7:30AM. The official I went to was very nice, she checked our papers (ie application form, old EAD, I485 Recceipt notice etc) and approved it on the spot. They take picture there so no need to carry them. Make sure you have $100 money order per application payable to INS. (If you forget, there is a shop in same building which charges $5 per money order).
Good luck