The Flexfuel emblem I got cost about $20, and that's assuming the stealership doesn't get a discount, or for that matter get it free since it is missing OEM.
Again, though, I would be concerned it was a damaged bumper replaced. I just had that work done after being rear ended, and the body shop ended up having to buy new badges, since the cleaning and repair included removing the originals, and getting them clean enough to stick back on correctly isn't worth it.