John Smith 
Adam Bennia, Claire Holden and Liam Saunders all admitted selling the Class A drugs as part of a drug supply line.
They were sentenced at Sheffield Crown Court on 10 April, with Holden, from Hull, being jailed for three years.
Bennia, from Balby, was jailed for three years and eight months, with Saunders, of Doncaster, being jailed for two years and four months.
The dealers were uncovered as part of an “ongoing intensive operation to dismantle Doncaster’s drug supply network”, South Yorkshire Police said.
The three were arrested as part of the operation in January 2024 and had been dealing drugs between February and June 2023.
Bennia, 28, of Alexandra Road, was caught when he was seen on camera topping up a mobile phone that was used to message buyers.
He pleaded guilty to eight counts of supplying the drugs at a previous hearing.
Holden, 39, of Princes Avenue, was implicated by a distinctive tattoo on her neck which matched her to footage captured from the scene of a deal which she instigated, police added.
She was jailed after pleading guilty to six counts of supplying the drugs.
Saunders, 34, of College Road, pleaded guilty to two counts of supplying drugs.
All were told money would be recovered through the proceeds of crime act.
PC Lee Ashworth, from South Yorkshire Police, said crime groups who “terrorise” communities were funded by the illegal drugs trade.
“Every dealer we remove from the network dismantles the capabilities and impacts the funds of these groups and we are determined to continue rooting out the people responsible for supplying these drugs across the city,” he added.
