More on Amazon.com : http://www.amazon.com/gp/product/B0012GVZDM?tag=thefatkidin06-20 128MB Memory Upgrade 4 HP Color LaserJet 2500 2500L 2500Lse 2500N 2500TN 2550 2550L 2550Ln 128MB Memory Upgrade for HP LaserJets 100 PIN 100MHz Q9121A