https://www.gamespot.com/articles/early-ps4-black-friday-2017-deal-gets-you-ps-plus-/1100-6455094/

Although there were few deals on PlayStation Plus memberships included in the early Black Friday ads that were released, this has turned out to be a good week to subscribe or extend your membership. Those interested in a year of PS Plus can currently pick it up at a nice discount--and you don't even have to wait for Black Friday to actually begin.