Diastatic Malt Powder in Boston area

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Hi,  I would like to make the bagel recipe in Hamelman's Bread which calls for diastatic malt powder.   I found some for 2.50 a pound on Amazon and 3 somthing a pound on King Arthur.  In each case shipping is more than the cost of the ingredient.   Anyone know where I can find this in the Boston area?   I live in Lexington, so preferably within easy reach of that.   Also, same question about baking supplies in general.   When I do a search on baking supplies in Boston I always get back a list of bakeries.   I would like to buy some pans, etc. and I would prefer to do locally rather than online if possible.   Thanks!  Varda