My brother has a front end alignment and chassis business in Tucson.  He does quite a lot of his business through BX, a business exchange.  He will align and balance the tires for a used car dealer or a resturanter and accept payment in BX credits that he uses to pay for anything other BX participating companies offer.  This includes meals in resturants, used cars, hotel rooms, etc., etc.  BX participants do pay sales tax on their transactions, but at about one half of the nominal value of said goods or services.  How they worked that out I do not know, but he has been doing this for years.

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