I know someone was asking about this a few months ago so here's what I just bought from WalMart.
Monster 700 iCar dual USB charger.
It charges iPad2 and iPhone simultaneously, and the iPad shows the charging symbol. No way of checking, but I'm thinking it will probably charge the new iPad too given that is supplies enough power to do what it's doing for me.
CDN$33 including tax.
Sent from my iPad 4 HD mini