Where ever you live, there is always a minimarket close by. These minimarkets usually do not have a large assortment of products but when you need something fast you can ussualy find it there.
Aruba also has quite a few large supermarkets, most of them are located in a group at the L.G. Smith Boulevard. These supermarkets have products from Holland, the US and Venzuela, so you can always find many of the things you are used to.
The prices differ from one supermarket to the next, and also the products, so the best thing to do is visit them all and find the one you like best. Since they are all located in a group, this is easy to do.
One thing to remember, everything they have has to be shipped here and some products are not always available, so if there is something you really can not life without get a lot of it!