In NY you should be able to find a good fish market. Try jumbo fluke, sword, halibut, flounder, or rockfish. If you like stronger, oily fish, get some mackerel, bluefish, or barracuda. That only scratches the surface.
BTW - Tilapia are scat eaters. There are a lot better fish to fry.
Believe it or not, I went to shoprite and midnight and they had a huge selection. I was shocked.
But in Brooklyn, forget about it, you could probably find an awesome place. Im on staten island. I should look some places up but there are even big ones here, I heard.
You do not want to know how much raw Ahi poke and sashimi I have consumed in the last ten years or so. Likely more that than the total of cooked tuna of the vast majority of Americans have had in their lives.
As far as perfectly (or barely) cooked Ahi, still ruby red in the middle, if you ever get to a Roy's restaurant, have the seared Ahi appetizer, it will change your mind. It does need to be top grade fish though, most probably is not.