Having had bumpers re-plated, 20 years ago, and taking advantage of a favorable exchange rate with Canada, it was well over $1000 to plate my original bumpers. I would imagine today the cost might be at least 2 to 3 times that. And yes a re-plated bumper will be significantly better than factory chrome.
One front bumper part, original, from Mercedes Benz, is still available and they are nearly $2000 each.
There are a very large number of both new and used bumpers available on eBay. It is difficult to tell from the listings whether or not they are factory OEM or reproductions. I would imagine in some cases the seller doesn’t even know.