1. Save at a town or an area where you can buy items.
2. Drop all of your items
3. Import character from step 1. You now have the items on the floor and in your inventory.
4. Sell all your items
5. Save in a different spot than step 1.
6. Import from step 1
7. Sell all items
8. Repeat step 5-7, until your done.
9. Now that you have alot of money buy more expensive items. and repeat from step one.