Things I use a lot of--cumin, black pepper, thyme, I buy in pint or quart sizes at Smart&Final.
I know that chain isn't back east, but it's a restaurant supply type of place.
The markets here also have an aisle of Mexican products which include cellophane packets of many spices (along with the usual dried chiles and corn husks) at a fraction of the price of jars in the spice aisle. If there is a large Mexican population anywhere near you it might be worth checking the local market.