In a rather shocking revelation, it has been found that Islamic State militants have been selling Yazidi and Christian girls as young as one to nine years of age for a price of $172 in Iraq.

Activists working 'secretly' out of Iraq have leaked a 'price list' of the ISIS slave markets, from where men can buy Yazidi and Christian women as 'sex slaves.'

According to a report published by Iraqi News, ISIS has imposed these 'price controls' over the sale of women and spoils of war, including cattle as the market lately has experienced a down-turn.

It also stated that those disobeying the diktat 'would be executed.'

On the price list, the youngest is a mere one-year-old girl, while the oldest is 50.

The price for the girls between one- and nine-years is the highest, followed by Yazidi or Christian girls between the ages of 10 and 20, priced at $130.

Women between the ages of 20 and 30 were being sold for $86; a 30 to 40 year was being sold for $75 and 40 to 50 year old women were listed for sale at a price of $43.

The barbaric group that has full-fledged slave markets both in Mosul, Iraq and Raqqa, Syria; has even gone to the extent of justifying its kidnapping of women as sex slaves citing Islamic theology.

"One should remember that enslaving the families of the kuffar -- the infidels -- and taking their women as concubines is a firmly established aspect of the Shariah, or Islamic law," the group had said in an online magazine report, reported CNN.

In the price list translated from Arabic, the ISIS says: "In the name of Allah, most gracious and merciful. We have received news that the demand in women and cattle markets has sharply decreased and that will affected Islamic State revenues as well as the funding of the Mujaheddin in the battlefield. We have made some changes. Below are the prices of Yazidi and Christian women."

After listing out the prices on the women, the ISIS notes that "consumers are allowed to purchase only three slaves at a time, except those from Turkey, Syria and Gulf."

The price list reportedly is dated 16 October,2014. The authenticity of the list that has widely been shared on social media could not be verified independently.

The revelation comes only days after a shocking video purports to show Islamic State (ISIS) fighters bargaining over Yazidi women at a "slave market."

The clip shows how ISIS fighters were negotiating the prices of girls based on their eye colour. Those with blue and green eyes fetched the highest amount.