1GB (1x1GB) Memory RAM for Apple PowerBook G4 1.5 12" (Aluminum) BY CMS A50 | eBay
1GB Team High Performance Memory RAM Upgrade Single Stick For PowerBook G4 1.5 15” (Al) M9422LL/A PowerBook 5,4 1. The Memory Kit comes with Life Time Warranty. at Amazon.com
512MB PC133 SDRAM 144 pin SO-DIMM Memory RAM for Apple PowerBook G4 Titanium 800MHz 867MHz 1GHz (PARTS-QUICK Brand) at Amazon.com
PowerBook G4 (15" - Titanium) — mac27.net
40 for a 12' Powerbook G4 from FB marketplace (866mhz / 512mb ram) - Now installing Tiger 🐯 : r/VintageApple
1GB RAM Memory Upgrade for the iBook G4 and Powerbook G4 Apple Notebooks Laptops | eBay
256MB RAM Memory for Apple PowerBook G4 17-in 1.0-1.5GHz Black Diamond Memory Module DDR SO-DIMM 200pin PC2700 333MHz Upgrade System Specific Memory - Newegg.com
Apple POWERBOOK G4 A1013 Refurbished Laptop 4GB RAM 250GB HDD
PowerBook G4 Titanium DVI RAM Replacement - iFixit Repair Guide