A Deliveroo spokesperson confirmed the pricing error.
"Yesterday we experienced a brief temporary issue involving items in a promotional campaign with one partner being priced incorrectly," they said.
Meanwhile, Sally Marie from Bolton said like many who bought discounted goods on Thursday evening, she found out about it from a website which called it a "glitch".
"I was sat on the sofa and thought I'd give it a go before the Co-op ran out of stock," she said.
"I quickly installed Deliveroo, and to my surprise, I found some items priced at zero."
Her order arrived just 15 minutes later.
