blank ds / 3ds game cartridge

[gasaneris]

I have a few ds/3ds consoles on display in my gaming room. I've been trying to find something that's the same size, shape, etc to ds and 3ds games to put inside the display ds's so that I can put my games back into their case on the shelf and don't have to leave them with an open holes. anyone know of something I'm looking for?
192.168.0.1 router login 192.168.l.l