L'auberge Casino in Baton Rouge has a steakhouse that serves A-5 and does a pretty damn good job with it. The price wasn't unreasonable, I think it was $110 for a 6oz bone in filet and was cooked really well (rare) with the marrow bubbling up to perfection.
I ate there a few times. Service was hit or miss which shouldn't be something you say for a high end restaurant. The food can take a while to get to the table but the quality and taste was always on point.