Food services contractor Aramark initiated the "iCare" online ordering system.
Darrell Wagner, who oversees the for-profit operation for the sheriff's office, told the San Antonio Express-News that the county gets to keep 29 percent of every sale.
A jumbo cheeseburger with fries goes for $8.99. The food is cooked on-site and delivered to the inmate while still hot.
Pizza, wings and nachos are also available to inmates, at a cost, along with cupcakes, doughnuts and candy bars.