Sorry, should've re-read my post. I meant to say I get my cheese from casein A2 cows. Butter, cream cheese, and heavy cream contain very little casein anyway and not enough to be significant.
Brands of cheese...there are too many to name. I wouldn't get cheese from the US, Spain, or Holstein cows in general. Gurnsey cows are safe, but otherwise you'd have to call up the company and ask them. Good luck finding anyone who has a clue what casein A2 is. I have found Jeni's ice cream online to be made of casein A2 cowmilk though.