Sure, first go to a quiet place, anywhere in the wilderness will do
1. Save your game
2. Enter the shop, take what you need
3. Drop your items, wait for them to settle
4. Save again in a new slot
5. Extract both saves in seperate directories (azp x "save name")
6. Copy the sector that has changed from the second save to the first.
7. Repack the first save with the new sector file (azp ar "save name" *)
8. Move save back in place and reload
