OWW1 maintains locking mailboxes located on S. Century Drive, between Gross Drive and Big River Drive.  The cost of a mailbox is $50, with all fees going into a mailbox repair/replacement account.  Half of the fee—$25—is refundable, upon termination of mailbox use and surrendering of the key.  In the event of a key loss, a replacement will be provided for a $5 fee.  You can order a mailbox online here.