The series · snapshots 2026-09-10 → 2026-09-10

What changed, week over week

Every weekly survey is archived immutably (download any snapshot) and diffed here: prices that moved, grades that changed, listings that appeared or vanished. This page is the historical series in the open — it cannot be reconstructed retroactively, and it is never rewritten.

History begins 2026-09-10. The first week-over-week diff appears with the second survey (Wednesdays). The snapshot archive is already live on the data page — every future revision of history is checkable against it.