There is a glitch in the game that will let you get shop items for free, and even receive money for buying items. You need to be able to afford the item first. As you enter a shop, use a Storm Puff (lightning cloud) item. Then run to the shopkeeper, and speak to him. While in the middle of the conversation, you will be hit by the lightning bolt attack, and will gain control of the player, which is not normally possible. Select the item you want to buy using UP/DOWN and B (pressing LEFT here leaves the shop). At the YES/NO prompt, move as far to the left as you can without leaving the area. Make sure the cursor is on NO, then hold LEFT (moves cursor to YES and moves player) and press B to confirm the purchase while the screen begins to fade out. During normal game behavior, you stand still at the shop while your gems tick down. But when you have control of the player, you can leave the shop before the gems tick down. Then when you enter a new place, the game gets confused and starts ADDING gems instead of subtracting them. So you can buy expensive items, and gain money.