Your shelves now come with you to the new store. They arrive as boxes near the stockroom, with the items that were on them and their prices: all you have to do is put them back wherever you like. Nothing to buy again, nothing to re-price.
If you had already moved before this update and lost your furniture, a catch-up delivery will be waiting for you next time you play: one stocked shelf for every product you hold the license for. That was our mistake, and we're sorry for the trouble.
The new store is still free, but it only becomes available once the tutorial is complete — two new steps lead you there