We are very sorry if you are having trouble with the regular order form!
That can often be a result of not entering a billing address that matches the one your credit card issuer has connected to your account.
If you need to enter a billing address that is different from your shipping address, just let us know after placing your order to update your shipping address and we will get that done for you.
Please be aware, since that is a very simple order form designed especially to try to help orders go through, no bonus item is included on that order form, but we can add you to the fulfillment list for it manually. You must contact us after your purchase to request that. (International purchasers must pay an additional $10 shipping cost for that bonus item.)
If you still have trouble purchasing even on that simple order form, it means that your card issuer is declining the purchase. You would need to contact them directly for help getting them to lift their block on the transaction.