Keycool's 22 key numpad has had some good things said about it. I like that this is a new thread so I can jump straight in about KC's good build quality. It might have a few more keys than you are after, but it looks pretty good.
I am trying to look around to see where you can get one in stock, blacks look out of stock, but you might have some luck going onto mechanicalkeyboards.com's vendor forum on here and asking when they will get them back in stock again.