The original Ives 201 power house (not the re-badged Lionel 435/436) has not been reproduced.
And sure, they come up for sale. I got my 1912 version on a table in the blue hall at York a few years back. In good shape they are a scarce, high-ticket item, so it's not surprising I have seen more of them in sales by the auction houses like Stout or Maurer. The chimney is in several parts, including the cast iron top, some or all of which are often missing. Mine has its wood base with the coil transformer mounted on it inside.
david