I tried two credit cards with plenty of available funds and the transaction will not post because of the above error message. Please help.

Hello James,
Thank you for your question about your payment attempt. What our card processor shows for each of the 4 attempts is:
"Payment failed because of insufficient funds. Tell the customer to try a different payment method, or they can retry the payment at a later date."
Unfortunately, that is all the information we have.
Please let us know if you have any other questions, or require other assistance. We are happy to help.