Sutlers aren't as well organized in the Napoleonic scene as they are in ACW, not in Europe and not in the US/Canada. It's frustrating, but hardly surprising considering the massive amount of sub-periods, countries and units. I mean, even when you want to do a normal French line infantry men, you have to pick early Revolutionary (1792-95), late Revolutionary (96-01), Early Napoleonic (02-06), mid-Napoleonic (07-10), Russia, (10-12) or late Napoleonic, ('13-'15). And technically, Waterloo would be a whole different impression but we all pretty much just pretend it isn't, and then I'm already splitting Mid-Napoleonic and Russia into two periods. For each of these periods, there was a difference in uniform.
Nico knows some American guys doing an extremely nice Bardin impression, although I believe they made most of their things themselves. There's also a small light infantry regiment that has a pretty good impression. As for the 21e... I'll just join Zac in not commenting.