La Choza is awesome... is there a list of places that sell it? Only problem is sometimes they run out of the flavor I want.
i know at least 3 in palermo, there is a couple in san telmo, not all of them are open every day. La Choza delivers to the city on wednesdays and saturdays.
Bonpland 1660, Mercado de Economia Solidaria, the first shop right in front of the entrance. You can ask them to hold it for you till the end of the day you intend to pick it up.
Another place is Mercado Punto Verde at Dorrego 1429 - just off Cordoba, they are open Wed, Friday, Sat and have all the La Choza products as well - butter, cheese, milk, yogourts and some other vendors selling organic grains, produce, eggs, oils, honey, etc.
You can also buy it much cheaper online from those guys
http://tiendadelaaurora.com/categoria-producto/lacteos/, but unless you get 900 pesos staff worth they charge for delivery.
If you are near san telmo I can get the exact address of the places