What payment methods can I use to buy bitcoins?

Short Answer:

Currently we only take cash. 

Long Answer:

Due to the lack of bank interested in people using decentralized, stateless currency (because it is directly competitive to their centralized, government backed currency), we cannot get an arrangement to process ATM/debit/credit cards at our machines. It is however technically possible if we could find a bank that would allow it. There are no bitcoin ATM companies in the USA that accept any form of payment for Bitcoin other than cash.