3 buck chuck is not the same wine each time. It is whatever is surplus and they can get for a low price (and meets whatever their quality standards are), and sometimes it is the exact same wine that goes for $40 or more. They sell it off for cheap to reduce supply to maximize profits. I know a "wine snob" from Napa -- he actually was paid well to write about wine -- and he explained in detail, and mentioned that there were lots of "in the know" wine lovers who would go to Trader Joe's, buy a bottle, take it to their car and taste it to decide if they wanted to go back in and grab 20 bottles.