I think you missed my point. "Sashimi" isn't a grade, the FDA doesn't recognize it as such. They do however recommend that fish to be eaten raw should be frozen at a certain temp. for a certain period of time. Yes, if you're buying food in the good ol US of A, every retailer has to follow the FDA guidelines and your local health department and Agriculture department. I know this, because I work in the food industry.
What I'm saying is, a retailer (grocery store, fish market, whatever) labeling something as sushi/sashimi grade is using a marketing gimmick, probably so they can charge extra for it. If you want to eat raw fish, buy the frozen stuff (because it's safer) and save your self some money.
Example, where I work fresh caught Yellowfin Tuna goes for 8.99 per 6oz boneless skinless portion. The same Yellowfin tuna that is frozen (caught in the same country according the COOL labeling) is 5.99 for two 6oz portions.
I'm not trying to be argumentative, but sushi grade or sashimi grade fish isn't a true "grade," it's marketing plain and simple.