I have an extra-large steel pan that is as flat as f****. But yes, the expensive Le Creuset.
If it’s supposed to be steel, the American "All Clad 3" is recommendable.
Otherwise, I’ve had that problem too.
However, never with my DeBuyer cast iron pan. It looks really worn out now: black inside, spotted outside. And it gets better with every bit of patina.
Le Creuset items often come with a lifetime warranty. An acquaintance recently got a pot replaced because of chipped enamel – after 17 years. Sometimes high prices are worth it because there is value in return.