here is two thunder power 10s packs 5000mah for $136. normally $500 packs. if you had 10s packs and want to parallel you could saddle pack them on the chassis. just a thought. would look cleaner and might be easier to keep locked down than four packs floating around. this would give you 10s 10000mah.
http://www.espritmodel.com/index.asp...OD&ProdID=9837