A look at surveillance pricing, a practice Toronto may ban in grocery stores  CTV NewsCan Toronto ban ‘surveillance pricing’ in city grocery stores? Mayor Olivia Chow wants to try  Toronto Star‘Rip off’: Mayor Chow wants to ban ‘surveillance pricing’ at Toronto grocery stores  CityNews TorontoOlivia Chow wants ban on ‘surveillance pricing’ by online grocery retailers  Toronto SunToronto mayor, local councillors look to ban surveillance pricing in city  CBC