Mobil 1 is available, and advertised, world wide.
AMSOIL is a very small company, with sales that have probably doubled over the past three years.
My guess is that AMSOIL is probably second in total gallonage of synthetics, well behind Mobil 1.
Mobil will cut prices of Mobil 1. The franchised Mobil station owners often go to Costco or WalMart to purchase their Mobil 1, because it is much higher when brought to them by the Mobil distributer.
Sure, Mobil 1 costs $5, or a bit less, per quart at the discount store. Shop owner told me the other day that the list price was over $11 a qt.
in Europe, runs $15-20 a qt (lots of taxes).
Mobil offered a nearby shop using AMSOIL $35K to change----
AMSOIL won't discount prices, and does protect its dealers. So, you won't see it at WalMart, K-Mart, Advance Auto, etc.
Far as availability, obviously far more stores have Mobil 1 on the shelf, although not all carry all viscosities or other products.
AMSOIL products can be delivered to the door, in most cases within 1 to 3 days (in CONUS, anyhow)