Best Buy: Apple® PowerBook® G4 with 17" Display M9970LL/A
PowerBook G4 Memory Upgrade | London The Mac Response Centre
Computer Memory and RAM, Memory Stick, Memory Upgrade from Kingston, Crucial, Corsair, Mushkin, and More - Directron.com
1GB RAM Memory for Apple PowerBook G4 M9690LL/A (1.5Ghz 12-inch) Black Diamond Memory Module DDR SO-DIMM 200pin PC2700 333MHz Upgrade System Specific Memory - Newegg.com