I'm looking for the cheapest battery charger that will hold 4 batteries and will charge the 'official' gp2x batteries ( http://www.gp2xstore.com/products/Gp2x_Rec...eries-16-4.html ), know of one?

Any battery charger will work. Go down your local electronics store and look around. I just picked up a charger and it works.

Energizer sells a 15 minute charger. It's worth it's weight in gold. Whenever my '2x batteries die (and this happens a lot), there is only 15 minutes of 'down' time while waiting for the batteries to be recharged.

Another advantage for this fast charger is that I also use it to recharge my batteries for my MP3 player, portable radio and those of my Wii controllers.