Other World Computing (OWC) today announced that its MercuryPB SuperDrive internal optical drive upgrades are now available for US$149.95 (previously $179.95). It’s compatible with 12-, 15- and 17-inch Aluminum PowerBook G4s and 15-inch Titanium PowerBook G4s that run at 667-, 800-, 867MHz and 1GHz. In addition, the MercuryTi SuperDrive is available for $229.95 (previously $249.95), and is compatible with 400-, 500-, 550- and 667MHz versions of the Titanium PowerBook G4s. Both versions include NTI Dragonburn, EMC/Dantz Retrospect and 10 pieces of 8X DVD-R media.