I love the dollar coins. I used to take all my change to the post office, put it all in the stamp machine at once, buy a single stamp and get my change back in

I love the dollar coins. I used to take all my change to the post office, put it all in the stamp machine at once, buy a single stamp and get my change back in $1 coins. A lot of people must have done that because the software was changed at some point to not allow it.