Here in the Boston area generic (store brand) butter is around $3.50/lb, Vermont butter (Cabbot) $4.00, Midwest (LandOLakes) $4.50 and there are two butters from Ireland sold in half pound blocks for $4-5 depending. From Normandy is more (but I sometimes buy it). That's at my usual supermarket which I use because the prices are a bit lower than elsewhere - so maybe adjust up 10-15%.