What does it even mean "what America has to offer"? The Trader Joe stores are in America. True TJ is owned by a multi-national corporation, but almost all stores are owned by multi-national corporations. If what America has to offer only includes stores that are not owned by multi-national corporations then I'm not really sure what is left that TJ is being compared to.
I suspect that meant that many Americans will go out of their way to go to a Trader Joes, because their products are unique in some way. Ergo, the rest of "what America has to offer" isn't a good TJ replacement, either.
