carbon steel pans in dollar store
Steel is pretty much steel (carbon cast etc)

It's the surface that's needs to be conditioned. Only buy pans with a smooth surface regardless of price. Then use metal scourers and spatulas to remove any rough spots. And then regularly heat with oil until it smokes

For eggs, with a conditioned pan, pour in a layer of salt and heat until the salt discolours, discard salt, let cool a bit, roughly wipe out with paper, add a little oil, and the eggs should cook fine