Users can either purchase bitcoins or sell their bitcoins for cash. Ask an Expert. As the world becomes more crypto-friendly, an influx of companies on the Internet as well as in the real world are beginning to accept cryptocurrencies as payment, most notably bitcoin. Note that all purchases must be paid in cash, which helps the shop keep their prices reasonable by eliminating credit card processing fees. Don’t miss out! American Federal, located in a suburb of Phoenix, is known for offering reasonable prices and top-quality coins.