One of my favourites of late is 鲟鱼 (xún yú), Acipenser sturio, sturgeon.
This one kilo, sustainably farmed monster comes to me for 107元 / $15 USD or would do if I asked.
This is a dense meaty fish, similar to pork in feel and can be cooked in many ways including steaming, poaching, frying, grilling etc.
Instead, I buy this 熏鲟鱼 (xūn xún yú), hot smoked sturgeon. It comes from the top caviar producer in China (the world's largest caviar producer), Kaluga Queen.
At 22元 / $3 for 50g,it isn't cheap but so good I can't resist. I buy 10 packs at a time.
Of course I can also get the caviar. 104元 / $14.50 for 10g. A birthday treat.
Even better, have both together.