Chalov Yisroel is NOT all over, Yes its available in PARTS of NYC , You can find it in the 5 Towns , Teaneck and some parts of NJ
But thats IT
Ive been in other parts of the country and for example Ice Cream is usually Kosher in NY, it is NOT Kosher in most parts of the US (Except for National Brands like Breyes , Dreyers (Edys in NY) Ben and Jerrys and Haagan Daze
Why not take a road trip and see how difficult it is, Its even difficult on Long Island (outside the 5 towns)