Hello, try E Bay there are some real treasures there, prices vary. But most are original not repro, i have just bought a beautiful brass bell pull to cover a large hole in the front wall of my house, where the original had been ripped out.
Trouble is i now just need to get the bell and pulley set to go inside, no doubt one will turn up soon at the right price, as money is so important in doing up an old house!! Its always in short supply as is energy!
Good luck, just tap in victorian bell in the search box and lots should appear.
My son broke ours last year. Have been looking ever since. There was one on ebay but only found out months later. Best of luck. Let me know if you find one.