This has been discussed many times here. Almost nobody in my community keeps chalav Yisrael, and the major kashrut agencies and the local vaad allows non-CY dairy products. In the US no commercial milk from any animals other than cows, sheep, or goats are permitted to be transported across state lines, so it is basically impossible to substitute non-kosher milk for kosher milk. There is still the concern of non-kosher additives, which has occasionally happened; since all milk has additives you still need supervision. (Note: You an find imported camel milk in some specialty stores, and at a few farms.)
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