Kohada sells for 1,000 to 2,000JPY per kilogram on average, according to the wholesale prices at the Tokyo Metropolitan Central Wholesale Market in the last few years. If we estimate that one fish used for sushi weighs 40 grams, each costs 25 to 50JPY. Make two pieces out of one fish and we will have one piece for 12.5 to 25JPY. It takes time to prepare the fish, but the sushi tastes good for such a low price.
Since old days, gourmets have been very particular about the best time of eating kohada. The price for shinko in early summer can even exceed 50,000JPY(About 450USD) per kilogram. If one fish weighs 10 grams, each costs 500JPY. As shinko is smaller than kohada, you need two fishes for one sushi piece, which ends up costing 1,000JPY. Nevertheless, customers who are well-versed with Edomae sushi are waiting for shinko and cannot help paying for it despite the expense.