[ConservativeByChoice]

http://www.ustreas.gov/education/faq/currency/legal-tender.shtml

“There is, however, no Federal statute mandating that a private business, a person or an organization must accept currency or coins as for payment for goods and/or services. “

[meyer]

Well I'll be. Didn't expect that. Of course, there isn't yet a federal statute mandating that an individual shop at any given entity. At least not yet.

Frankly, any brick-and-mortar entity that doesn't accept cash is not going to get my business.