Teesside Crown Court heard how the 37-year-old was paid for the devices but could not provide them.
Cox, who previously admitted four fraud charges, was jailed for two years.
Judge George Moorhouse said her offending had "caused misery" to children last Christmas after "tricking" their parents into thinking she could supply the presents.
The mother-of-two told people she had a contact who could provide her with iPads for £50 to £100 off the retail price, using her "niceness" to "deceive" customers, the court heard.