Mayrand , "grocery warehouse"?
I buy big boxes of chocolate (11 lbs/ 5kg) there. Everything is bagged in big industrial sized packages. I find that if you keep an eye open for specials at the regular grocery store, it is cheaper. But, if you don't have much time to shop (or have a huge family) and have lots of storage space it is very convenient. And of course they have stuff everynow and then where you can buy a huge amount of something for dirt cheap.