One thing to consider about Cajun food, is that the majority of is was born of "in the kettle" type "recipes". Honestly, you can throw a lot of different things in a Gumbo or Jambalaya, and it works. I've eaten tomato based, chicken broth based, crab and fish roux based...it's all Cajun, and it's all good. Personally, I prefer a mix of tomato and broth...and the ingredients are available at any store. Even uncooked frozen shrimp is good...saute it with garlic, lemon juice, thyme, cayenne...or anything out there. Cajun is NOT what I would consider a "gotta-hava-recipe" type food. Look at a few recipes online, get an idea of the ingredients you might want to use, and personalize it.