The Meyenberg brand is sold a bunch of places. I know Madison Market has it, and likely Whole Foods, PCC, stores like that would as well. Possibly even trader Joe's because I think they carry Meyenberg goat milk.
I don't know if it's good quality. I bought it once and it was pretty pale. But I don't think any of the local goat dairies make butter or sell cream. Goat milk is lower % milkfat than cow or sheep, so I imagine it's kind of a pain.