Try using a computer with either Chrome or Firefox, if you aren't already. Please clear your cache, make sure all fields are completed, and that your billing zip code is correct. If you have tried checking out more than two times, your credit card company may block you from checking out on our site and you may need to call them.
If you've tried all of the above to no avail, give us a call at 1-844-233-5033. We'll be happy to try placing a manual order for you!