What is “common” to one coast is not often common to the other, based on availability, based on what people want and request, based on trucking costs, based on what can actually GROW in our region, etc. I can find oxtail in my local Market Baskets that cater to ethnic populations within that neighborhood. Whether it’s up to your seemingly impossibly high standards, I have no idea.
Each region of WF caters to what is desired or continually requested by customers. So what is continually requested in SD is not in Boston and, therefore, not available here.
As of 2014, 37.8 million people lived in California, and barely 7 million people lived in MA. The “demand by customers” cannot even begin to be compared between the two states.
We don’t have the amount of land mass that California has.
We don’t have the space for the farms that California has.
What is grown in California is not grown in Massachusetts, due to climate differences.
Items such as Thai eggplant are probably considered a specialty produce item and, therefore, not as readily available (or available at all).
California has a much larger Asian population than Massachusetts does. Items you’re used to easily getting in CA because it’s GROWN THERE are not going to be as readily available in MA. Plain and simple.
I would suggest going to restaurants that cater to the flavors/food items you are interested in and ask THEM where they get their local produce. You might find that they cannot get it either. And if restaurants cannot get it wholesale? You’re not going to get it retail.
As many have already said - stop thinking about what you used to be able to get in CA, and focus on what you CAN get in MA. Otherwise, you are going to be more miserable than you’ve already demonstrated that you are. The two states are on opposite ends of the country, have completely opposite types of climate throughout the year, and are different. So either embrace the difference, or move back to California.