A couple transported 1kg of cocaine from Liverpool to south Wales because they "thought they could get away with it," a judge said.
Dad-of-three Corey Casagrande, 34, and Jemma Connor, 27, were caught red-handed as they were driving along the A449.
The pair were arrested after police performed a tactical stop and found the huge haul of drugs.
In the footwell of the vehicle was a stash of the Class A drug with a wholesale value of around £40,000 – and a street value of many times that.
Cardiff Crown Court heard on December 9 last year officers, acting on intelligence, stopped a Ford car on the A449 near Abergavenny, Wales Online reported.
Peter Donnison, prosecuting, said police boxed the vehicle in and brought it to a stop.
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At the wheel of the car was Casagrande and alongside him in the passenger seat was his partner, Connor.
In the front passenger footwell of the couple's car was a package containing 1kg of cocaine and in the centre console police found £900 in cash.
The court heard the wholesale value of the consignment was around £40,000 but if broken down into street deals and sold on it would be worth "vastly more".
The defendants, both of Partridge Way, Duffryn, Newport, had previously pleaded guilty to possession of cocaine with intent to supply when they appeared in the dock for sentencing.
Connor has no previous convictions while Casagrande has previous convictions including for offences of attempted robbery and non-dwelling burglary.
Ieuan Bennett, for Connor, said the defendant had been persuaded "against her better judgement" by a family member to get involved in transporting the drugs to south Wales. He described her as "to a degree naive" and said she was "literally shaking like a leaf" at the thought of a possible jail sentence.
The barrister said the cocaine had been intercepted before it could reach the streets of south Wales, adding: "One can only hope the person or people who were putting pressure on her will get their comeuppance at some time in the future."
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Tim Evans, for Casagrande, said the dad-of-three had described his involvement in the drugs run as the most stupid thing he had ever done. He said it had been explained to his client's daughters in as gentle a way as possible about "the mess he has got himself into".
Judge Daniel Williams told the couple they had "lied your way through interview" to the police and probation officers.
He said: "You knew what you were doing. You did it for money and because you thought you could get away with it. You were being remarkably foolish, not naive."
Giving Casagrande a one-third discount for his guilty plea the judge sentenced him to two years and eight months in prison. The defendant will serve up to half that period in custody before being released on licence.
The judge said Connor had played a lesser role in the operation and given everything he had read about her it would be an injustice to impose immediate custody.
Giving her a one-third discount for her guilty plea he sentenced her to two years in prison suspended for two years with 250 hours of unpaid work and a rehabilitation course.