First you must save before purchasing chips from a shop, then buy the chips and clear out the stock, and go straight to the credits via the Ending Credits Trigger glitch. After the credits and returning to the game, you will be in the same spot as you last saved with whatever chips you bought after saving. The money you had will be intact and where you picked up the chips will have the same stock as you last saved. This glitch can expand to other sources of items and can be abused to obtain more stock than you’re supposed to in a single game. Chip Trading NPCs will also replenish their stock but the chips you traded away will not return.