Two Headed $1 Dollar Coin Nice!

Candace its not common but there are a few around I have a 2008 that been circulated and a full set of 2006 double heads that I put together over the years most say its mint sport but I have 3 that have come from circulation now and I paid a lot more then the $1600 they say you would pay 4000 to 5000 for a double header I need a double tails 20c to finish a set of double tail the search goes on to finish another set

Yeh its two halves

Shane,
With any coin, unless there is a whole heap of them made then they are likely mint sport or a prototype (or similar).
I believe that the dies are made so they normally cannot be put into a production machine with 2 heads or 2 tails.
The only sceneries where I can see 2 heads or 2 tails is
1 That a die was incorrectly made to go in the wrong side of the machine, but that seems pretty unlikely and would lead to a large number of them which would be found in circulation. This has not really happened.
2. "Mint sport"
I don't consider double "head"/"tails" coins to be genuine errors made during production.
Sure they are rare and interesting, but I don't think they are errors.
When searching coins, I look at both sides, but not because I am looking for both sides to be the same.
The last one I heard of being found in circulation was a 2007 5c, but it's been a long time since that was reported, so I don't think there was many of them made.