Try etsy.com - That's where I purchased a couple of mine. Otherwise, I have no clue of anywhere else to get them.

Classic accents.
Rejuvenation (way more expensive).

These are lovely. I've had similar ones now for 40 years.

https://www.signaturehardware.com/solid-brass-georgian-design-duplex-outlet-cover.html

Is the wall brass? : ) I doubt it........

Baldwin

Brass walls are available, if someone is interested:

https://www.proteksystem.com/product/wpb-12-brass-wall-system/

Outlet covers are not a design element and should be as invisible as possible.

Ive used signature hardware. My taste leans towards traditional.

i wouldn’t consider system that palimpsest posted because w/my vision, I’d NEVER find those outlets, ha.

I am also concerned about how marked these would get, and how do you clean some of the surfaces. The wood would burnish over time even if you were really clean.

I grew up in a house with mostly papered switchplates and outlet covers, but not everyone is careful about how clean their hands are.

They have them here:

https://www.rensup.com/switch-plates/cl/313.htm

For people who can afford it, what do you think of Forbes and Lomax as a high end solution?

I think Forbes and Lomax switches are beautiful. I think there are better outlet options.

I know nothing about OP’s house, and I would go for not lacquered brass and it’s lovely developing patina, but plastic outlet covers don’t look great in historic houses (nor do plastic windows, plastic siding, etc) - I’m replacing with what would have been there when outlets were installed. Plus I have so few outlets that each and every one deserves celebration.