WTB: 7-8 cell Nimh for friends Stampede

Ok, since im getting my Flux again, its gonna be somewhat unfair to be bashing around with my friends basically stock Stampede who has been using some 6 cell batterys that are kinda running outa steam. I dunno if he's gonna get a nicer brushless truck anytime soon, so I wanted to maybe get him some 7 or 8 cell Nimh packs so his little stampede has a little extra "ooopmh" to bash around with. This will be kind of a surprise gift to him, he doesn't know :)

Anyone got any quality, used 7-8 cell packs with Traxxas connectors that will fit in a Stampede and help my friend have a bit more fun with his stock truck until he can hopefully afford something faster? Thanks!