link for these specific versions, or should we look into the current market price for the physical box sets?

boasts an impressive array of hits, such as:

The Pet Shop Boys’ series is a masterclass in the art of the remix, documenting the duo's evolution from synth-pop pioneers to club icons. This 4-CD overview highlights the essential tracks from the four volumes released between 1986 and 2007. CD 1: Disco (1986)