I just get my Mobil-1 ATF and other products at the local AutoZone or Wal-Mart (love the 5-quart Mobil-1 oil jug!). Shipping would outstrip tax on that purchase due to weight, so you'd have to find a deep discount to justify online ordering. Not to beat up on the Amsoil guys, but Mobil-1 ATF has a proven track record (military, industrial and agricultural history) that's hard to ignore. Amsoil is the only other true synthetic, but you really have to wade through their literature to figure out which of their products are or aren't using synthetic base-stocks. IIRC they (Amsoil) have no background or track record with military, industrial and agricultural service.