And cheese too! but you will hardly find good cheesemaker at a piggy wiggly (or even in SF more reputable supermarkets). The best i had was one from Hungtinton's Farmer market (WV), easily a top4-top3 goat cheese.
As someone from Wisconsin, I can say with certainly that you can in fact get great cheese at Piggly Wiggly. I have no idea if they exist in other states though, and if they do the cheese is no doubt worse.
> There are a lot of great chocolate makers in the US.
Ghirardelli are decent, but I've been relatively hard-pressed to find decent American chocolatiers otherwise. In general, European chocolatiers are in a different league.
You won't generally find the best in the supermarket--probably either in the US or Europe. There are actually some pretty good more artisanal chocolate bars you can get in many supermarkets to my tastes. But they're still by definition mass market and (often) not as good as what some specialty maker with a small store has.
There are a lot of great chocolate makers in the US.