Kubara makes ready-made ramen broth. They currently offer shio (salt), shoyu (soy sauce) and yuzu shio (citrus salt) flavors. All are robust and full of flavor, but I like the shoyu (soy sauce) the best. All broths are based in seafood and kelp, but I am blown away by the depth and intensity they all have.
For more information about ramen, check out my Guide to Ramen Styles. Enjoy!