I love poke bowls myself and could eat it almost everyday for a light and delicious lunch but they're not terribly cheap. Bowls will run $8-12 and are usually on the smaller side. I made enough for four people with one lb. of sashimi grade tuna which is only $15 at Trader Joe's. Winning!
Also, I didn't buy kecap manis and just used more soy sauce to make up for it. Tasted delightful to me!
I bought the seaweed from a local Asian grocery store :) I also used sushi rice, but plain jasmine rice works too!