The US Mint announced:
The United States Mint has eliminated the credit and debit card purchase of $1 Coins through its Direct Ship Program effective July 22, 2011.
The Mint has determined that this policy change is prudent due to ongoing activity by individuals purchasing $1 coins with credit cards, accumulating frequent flyer miles, and then returning coins to local banks. Local banks, in turn, returned coins to the Federal Reserve. While not illegal, this activity was a clear abuse and misuse of the program.
If you have a mile collector in the family, give ’em a hug today.