I've got 2 original TI silent terminal keyboard for sale, price has been dropped a couple times. These has exactly the same key layout as the one used in the Smithsonian Apple 1. I thought to sell one of them with an assembled Apple 1 (still available) but since I see someone may build the Smithsonian wooden case, I think I should also open to sales on just the keyboard. They will come with an adapter board and cable so you can hook up with your Apple 1.
TI Silent 700 ASR Terminal Keyboard for Apple 1 Clone | replica Microswitch KSR | eBay