The affair about isolating onself with books among ourselves has already preceded…see links
However, as for those who either cannot travel to attend study circles due to genuine reasons or they have no lessons in their localities, or are prevented from attending all the lessons in their localities, then the recorded Duroos of the students are available, especially that of the elder students at Maktabah Salafiyyah. One will find an extensive series of lectures, especially at SP if he genuinely faces permanent obstacles to attend in person or cannot attend all the lessons.
*There are also the lessons of Ustaadh Abu Khadeejah (Kitaab At-Tawheed etc)
*There are other lessons in other Salaficentres (online), including al-Markazus Salafi Manchester.
May Allaah grant us Tawfeeq