Hi Wendy! Our sincerest apologies for any inconvenience caused! We have different sales just about every day, and this is most likely why you will notice the fluctuation of the prices on items within your shopping cart. For more information regarding Credits and Promotions, please go to the following link: https://www.opensky.com/customer-support?topic=961315 If you require additional assistance, please feel free to call our Customer Love team directly at (844)707-7779, between 9 AM and 5 PM ET, and we will do our best to help you out. You can also send us an email from https://www.opensky.com/content/contact-us if you would prefer.