Krogers and Giant Eagle both carry everything you need. I should have mentioned the blade. I keep a paper towel and cut sushi by the faucet in kitchen. After every slice I rinse the blade and give it a quick wipe wet blade again and cut next piece. If not knife blade gunks up and you just rip your sushi apart lol.
Also I make it with and without rice vinegar. I prefer it better without the rice vinegar. Wife likes it with it.