That's easy - we don't have any. Our business model is 100% e-commerce - all label orders are placed through the online store and need a valid credit card to proceed. By operating this way, we're able to keep our costs (and therefore prices) as low as possible.
NOTE: your credit card is never pre-authorized or charged until we've successfully completed the proofing process and you've given us explicit permission to print. We only capture the credit card details during the ordering process so we can check that it's a valid card and can then streamline the transaction process once you've approved proofs.