most laptop chargers are around 19V 3.5A.
sure, a buck converter will easily get you to 15V, but 3.5A will run one low powered peltier, so not really an option...
http://pages.ebay.com/link/?nav=item.view&id=181641792716&alt=web
you don't need to open it up, just solder on a few wires, and...