Each prisoner's cell should come with a TV.
Inmates are to be given hundreds flat screen televisions in an attempt by prison bosses to meet energy efficiency targets.
Among the prisons where the TVs will be distributed is the maximum security Shotts prison, which houses some of Scotland's most dangerous criminals.
The SPS said TVs have been "a feature" of prisons since 1999 when Labour began eight years in administration at Holyrood.
A spokesman for the service said: "SPS are seeking a future supply of in-cell televisions which are energy efficient to meet SPS green targets.
"It will require that the supplier holds stock that prisons will draw down as required."
The spokesman added: "Prisoners are charged £1 per week for televisions and we have around 7,800 prisoners at the moment. There is, therefore, no cost to the taxpayer.
"Televisions are not a right but a privilege, and prisoners have them at the discretion of the governor."