I know van remortels in Belgium charge around £70 to have a pallet delivered. So it is not much cheaper than the UK. The big difference is the quality of the goods and the selection you can get which is 100% better than the UK.
I make a weekend of it with my girlie as they have Sunday open days...so travel over late Saturday on the tunnel, nice hotel, beer and food, then a Berlingo van full to the top of goodies and home..and a Berlingo can fit £1500 of sundries with space to spare.. !!