Hi -

If you are fortunate enough to live near a Trader Joe store (and there
are several near Boston) then check out their options on rice beverage.
They have four different brands, three of which my son likes. (He won't
drink the Pacific brand, but loves Westbrae and Trader Joe brands.)  Their
prices are excellent, too.  We live in DC, but when we drive north to visit
grandparents we always stock up on a variety of dairy-free Trader Joe
items.

I think if you dial 1-800-shoptjs then you'll find the location of the
nearest store.  Our nearest is a 4-hour drive ...

--Beth Kevles
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  http://web.mit.edu/kevles/www/nomilk.html -- a page for the milk-allergic