It will cost $115 to purchase all items in the Sushi Bar.
Can easily be farmed parking a second player off screen, farming screen until no more enemies respawn. Then zone to next screen and repeat.
If you die you will lose 1/2 money acquired UNLESS the other player has zoned off screen.
I did my farming at the Benny and Clyde boss screen. The screen to the right of "Waterfront Mall" is the "Capital Ave. bridge" screen. As soon as you start there will be a brown path at the top of the screen, just to the left of the bridge. Hold up to enter. The bosses will respawn every time you zone off screen and return, and drop more money than the regular enemies.
Around $7.00 per screen if you get them both.