Unfortunately, we do not currently offer "singles" through our Mega Distribution Bundle packages. All Mega Distribution Bundles will be setup as full "album" submissions with CD Baby, regardless of how many tracks are on your album.
You are definitely still able to release "singles" through us by purchasing a Mega Distribution Bundle package, but it is much more cost effective for you to sign your "single" up directly through CD Baby.
CD Baby currently charges $9.95 for a single submission and $34.95 for Pro single submissions. For more information about CD Baby's services, we recommend visiting: http://members.cdbaby.com/cd-baby-cost.aspx. If you have any further questions about CD Baby's services, we recommend contacting CD Baby at 1-800-BUY-MY-CD or CDBaby@cdbaby.com.