The low-cost tickets to President Barack Obama's inaugural ball were mistakenly put on sale a day early and are now sold out.

Inaugural officials say the limited number of $60 tickets to the Jan. 21 ball that were supposed to go on sale Monday morning quickly sold out in advance after Ticketmaster mistakenly put them on sale Sunday evening. Ticketmaster said during an email system test, it inadvertently sent a message early to those who wanted to be notified.

Inaugural officials won't say how many of the $60 tickets were sold or how much they are going to charge for future tickets that might be offered.

Obama plans a second ball on inauguration night in honor of U.S. troops, with tickets distributed free to military members.