https://www.delladapterprogram.com
if you guys have an old dell laptop of any of the following models, check the AC adapter's serial number.. you may be entitled to a free replacement.
Latitude CP, CPi, CPiA, CPtC, CPiR, CPxH, CPtV, CS, CSx, CPxJ, CPtS, C500, C510, C600, C610, C800, C805, C810, V700, C-Dock, C-Port
Inspiron 2500, 2600, 3500, 3700, 3800, 4000, 4100, 4150, 5000, 5000E, 7500, 7550, 8000, 8100, Advanced Port Replicator, Docking Station
Precision M40
I have about 10 of these fuckers. ebay here i come!