Some sellers list “DD Polly Sets 1-75 – Complete Collection” for $50 or more. They advertise that “all are available here.” What they do not tell you is that:

Finding a singular repository eliminates the grueling process of cross-referencing dozens of broken forum links and dead auction listings.

: If "DD Polly" refers to a character or mascot, this might be about a collectible series where 75 different versions or iterations are being made available.

Introduction of the "Locket" sets and the first Light-Up compacts.

Based on the individual components of the phrase, here are the most likely contexts for such a specific sequence of terms: