None of the courses belong to a Coursera Specialization. This offer is only valid until the end of July 2020. Once you checkout, you will have 180 days to earn a certificate. Each of these courses are priced in the range of $49 ~ $200.
These courses come from ~50 universities including Penn, Georgia Tech, Johns Hopkins, Caltech, Duke, and Imperial College London. Courses from companies like Google, Microsoft and Amazon are also included.