The complex has two shops. One sells religious stuff mostly; candles, books, statues etc.. We found this shop open on sundays. The other one is a small supermarket and is apparently closed on sundays. Here products made in other monasteries and convents are being sold, such as candles, soap and even toys, as well as the normal everyday necessities. Of course you can buy the abbey's own beers here, but there's a choice of others as well. The abbey also has its own wine ('t Paterke), not made here but made for the abbey anyway, which my wife found far too sweet but my mother-in-law says it should be drunk for dessert. Also you'll find a very nice choice of Belgian chocolate. We bought us a piece with the highest cacao level and found out that it tasted like soap!
The Food & Drink market sells anything from beer glasses to meats & cheese. It was one of my favorite parts of the Abbey.