I just moved fro Calgary Canada and previous to that I was in LA. Boston has some very high rates for produce!! My god. I thought Canada would be expensive, but it is consistently half the price of the cost on all groceries here (prior to exchange rates). In LA, I found great stuff at AMAZING prices at Superior Warehouse which was a large grocery store slightly tiled towards the Hispanic market.
I am looking for groceries stores that dont have the prices of Whole Foods, Shaws and Stop & Shop. Costco is the best thing I know of. Anything else? Anything without the need to buy wholesale?