Where can you buy butter in bulk?

Anyone else surprised by the tiny little packets of butter sold in Uruguay?...  If you are a baker like me, or just like butter, you have to buy multiple small 200gram packets of butter for around 45-55 pesos per packet!  However, if you shop at your local street market vendors you can buy great fresh butter for $150 per kilo!  I picked this butter up from the Sunday market held on Jamaica Street (where it crosses Arocena):