The best choices for cast iron skillet substitutes are tri-ply stainless-steel skillets, nickel-plated skillets, Dutch ovens, saucepans, or Pyrex casserole dishes. Your substitution will depend on the recipe you choose, cooking method, duration, and temperature called for in your recipe.
While your recipe will likely work fine with a normal pan, it won't develop the same kind of crispy exterior that it might with cast iron. If you don't have a cast iron pan and aren't willing to buy one today then use what you have. Even if it doesn't work as well it will be better than not making anything.