All of these offer at least a free trial. Some of them are offering free subscriptions for the duration of the emergency. Since we as a school do not use each of these, parents will need to set up accounts for their students.
studyisland.com (Reading, Math, and Science)
memorialmuseum.com/trunks (covers the Oklahoma City Bombing)
wonderopolis.org (all subjects)
stories.audible.com (streams stories on any device)
ck12.org (all subjects)