saving plans cart can'y purchase

I understand you're having trouble purchasing a Savings Plan where the "Submit order" button keeps loading without proceeding to payment.

This appears to be a technical issue with the AWS console. Here are some troubleshooting steps you can try:

1. Clear your browser cache and cookies, then try again
2. Try using a different web browser
3. Disable any browser extensions that might be interfering with the checkout process
4. Ensure your internet connection is stable
5. Try accessing the AWS console during a different time of day (in case there are temporary service issues)

If you continue to experience this issue after trying these steps, I would recommend opening a ticket with AWS Support since this is related to billing and Savings Plans purchases. They can investigate the specific issue with your account and provide direct assistance with completing your purchase.

The Savings Plan you're trying to purchase appears to be for EC2 instances. Once you're able to complete the purchase, remember that the hourly commitment amount you enter should be the Savings Plan rate (not the On-Demand price), and you'll receive the appropriate discount based on your commitment term and payment option.
Sources
Looking to buy a Savings Plan but no discount is offered? | AWS re:Post
Stacking of EC2 Saving Plans on the same Instance Familiy | AWS re:Post
AWS Billing - EC2 - Compute saving | AWS re:Post