I think I would settle for 6 loose gp cells at promatchracing. They're 32.99 each and 1.17v @ 30 amps. You can also buy 6 IB 3800 cells for 43.19 or something like that with numbers 1.175v. If you wan't your packs assembled, they cost $5 more. I bought matched 7 cell gp packs from them a year. The packs are still in use.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy