Inexpensive Storage of Terrabytes on WORM Media?

noSpaceleftonDevice asks: "The company I work for stores large amounts of data on magnetic-optical platters. We currently buy these for about $60 per 4.6 GB platter. So far, we have over a terabyte stored, which really adds up (especially considering each items is stored on multiple disks and stored off site for redundancy and safety), and my guess is that we will write that much again in the next 12 months. We could use standard write-once CDs (which are much cheaper), but each terabyte would require well over 1000 CDs (not counting redundancy). Writing to, storing and managing this many platters quickly becomes unmanageable. I'm wondering if any of the Slashdot community knows of a better/faster/cheaper way to write large amounts of data on Write-Once Read-Many media."