i amjust now searching on e-bay for just such a transformer..
try www.ebay.com. My Gateway laptop takes a 19 volt plug
as well, and there are quite a few avaialbe. some models
require a specific one to provide their power...many diff.
brands and voltages ara available. try here:
http://computers.listings.ebay.com/Laptop-Parts-Accessories_Adapters-Chargers-for-Laptops_W0QQfromZR11QQsacategoryZ31510QQsocmdZListingItemListQQsocolumnlayoutZ3QQsocustoverrideZ1
oh my looks like a long URL..jsut go to e-bay and search
computers - laptops - accessories...charges, adapters...