[96z28ss]

If you take orders at a said price, and charge them on a credit card that price. Thats what it should cost the customer.
Its not the customers fault that you didn't have product on the shelf. Its not the customers fault that your supplier raised the price. You should be on top of that when your putting your order in.
You shouldn't have charged the customer till the product was ready to ship, and at that time, notified customer of a price increase before putting order in.