Isn't the low $30 range cheap enough for 12,000 BBs? That is what my last batch of Airsoft Elite .20s cost me. If you think that is expensive, you should try playing a game of paintball. You will really appreciate how inexpensive quality ammo is, for airsoft, after that.
Other than that I've run Inertia and KSC rounds before, they were decent. Never ran Airsoft Elite or Mauri's yet. I need to purchase more BB's soon though, definately gonna check out that Ohio retailer!