Pre-authorizing an item is to ensure you're first in line if an item either falls out of someone's cart or upon restock from a vendor. You will need to have a default payment card on file and once the item is available, you will be charged. Coupon codes cannot be used on pre authorized items. Please note that the system will default to the last card you used to purchase as you will have clicked "make default" when entering that card information. We use the preauthorizations to help determine interest in products for restocking as well. You are able to cancel pre authorized items if your interest has changed, or you have not received restock notifications from us on an item within 3 months time. Note you will not pay a shipping fee on items that you have purchased that were pre-authorized.