Not OP, but mine is Kawartha Dairy, which is great. It's a local company from Ontario, Canada, and the price isn't too bad.

My local Amish community has an annual fundraising auction day thing for their school. Dunno what the ice cream they make would be branded, but THAT STUFF.

There's no substitute for real, unsanitary, dairy. There's just good reasons not to do a lot of it, like crack.

In SF I do like Smitten ice cream :) I also tried this in Japan and loved it - https://www.nissei-com.co.jp/cremia/en/

Generally available I’d go for Straus creamery (who incidentally supply cream/base to many of the mom and pops around town).