Bezos is busting into the gas business. For Amazon Prime members , Fridays were no longer just the end of a long workweek or the start of a weekend list of to-dos. Thanks to the retail juggernaut, some drivers can receive a prime deal when they fill up their tanks. When the discount runs Amazon Prime members can receive an exclusive 25-cent-per-gallon gas bonus every Friday through the end of the year. This under-the-radar discount is built on an existing benefit, among the many Prime benefits