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Actually u get all the things here too. But its always better to get some stuff for initial setup. So here it goes:
some basic utensils
clothing -for very cold weather bcoz in october there is going to be very cold and windy and sometime late october snow too
masalas -very important thing as here u wont get the same taste
sweets -in boston specially u wont get any good sweets
medicines -some common medicines-like for fever, cold caugh, painkillers, bandages etc.
books -IT related books are very costly here so if your sister's hubby wants any books he should buy it from there it would be cheaper
Music cds -specially indian movie cds are really expensive
and when u come to boston dont buy anything before thanksgiving sale,
which will come in november around 20th-25th.
That one is a really good sale. Stuffs comes for really low prices.
And if your sister wants to know more about this sale she can email me after coming here. If I remember anything else I'll mail again.
Best of luck