I live in Canada and of the Walmart products I've only tasted the Thai Kitchen coconut milk which I thought was the best until I heared arroy-d is.
We make Thai Kitchen Coconut Milk from the pressing of fresh, ripe coconut meat. Prized in Thai cuisine for its delicate flavor and rich texture, Thai Kitchen.
My Walmart stocks coconut milk with the evaporated milk. If you want to add it to a cake, consider using coconut CREAM which is in the aisle.