Lastly, you should always concentrate your investigation on security measures, as they might lack the tools needed for you to properly safeguard your AmEx card balances. Buy bitcoins with gift cards. Each of the mentioned exchanges has its own pros and cons. Cons — takes days to get the cash-back into your bank account. Tell us how we can improve this post? Active 2 years, 10 months ago. If you have a leftover in gift cards, you can use them to transfer money to other users who might need the funds for the specific retail center.