If Mike can't get what you want, I bought my bigger packs from tis place:
http://www.espritmodel.com/accesories_batt_thunder.html
I'm pretty sure I got mine via air.
On a side note -- anyone use a cell balancer for their lipos? I saw that MGM Com Pro has one listed on their site, as does TP on the link above. I wonder if I should get one?