After entering in my shipping information, a rotating progress wheel appeared and has not gone away, ie cart is stuck.

This could be due to a number of reasons. It is important to note that until you see a confirmation you have not been charged. Your best option is to restart your computer or mobile device.

Related Questions:

• My credit card is declined, but the information entered is correct, why? 
• Why does the cart say "this store does not ship to your state"?
• Will I get a receipt for my order?