Cod fish in the USA

I'm a britfag in the US. So far I've learned that eating healthily is  damn near impossible in this fucking country. Walmart has two kinds of fish: catfish and tilapia. Where can I get Cod Fish? I tried Kroger, too, and they just have the same.
Also, it costs $3 for some fucking basil (23g). I can get 30g for under a dollar in the UK.
What the fuck am I doing wrong?
Should I just give up and eat a cheeseburger?

Try farmers markets. I can get a massive bunch of basil for a dollar.