This is where I got mine:
https://www.etsy.com/shop/vonHanke?ref=profile_header
He is where I got the coins I put on the bottom of my pieces, plus I've gotten two branding irons from him. I highly recommend spending the few extra dollars on his adjustable-heat iron, it is handy if you do a lot of different woods. You can also turn it down to do cardboard (like a box you are shipping), and my wife is experimenting using it on her bread.
I prefer torch in theory, but in reality the electric iron gives WAY more predictable results, especially in different kinds of woods.