iPad charging

I would like to buy an extra AC charger. The official Apple one is a little on the expensive side. Can anyone recommend an alternative?

Honestly I doubt any 3rd party store has received any 3rd party accessories yet...to soon...the iPad charge is a different wattage than iPod or iPhone...and 3rd party accessory companies would have NOT known this ahead of time... it will be a little while before anyone but Apple carries it...

@ShadyMac
Thanks for the reply. I will just have to wait, I see.

In my experience, even though the iPad reports "Not Charging", it will charge from a computer USB port (including a hub port) when it's turned off — but rather slowly. Mine went from 79% to 100% this way in about 3 hours.

Here's a good tip sheet...
http://images.appleinsider.com/iPad.review.003.png

how long does take yours iPad to fully charge an iPad with the 10W usb adapter ?

mine seems very long, about 4-5h

Has anyone tried using one of the charging pads (I believe it's called Powermat) yet? Supposedly they charge your cell phones wirelessly by just placing your phone on the pad. I was curious as to whether anyone has tried charging their iPad on one.

I went to the PowerMat site. There is no mention of the iPad. I doubt that a iPhone or iPod mat thingy would satisfactorily charge an iPad because of the higher charging rate ned by the iPad compared to an iPhone or iPod.