CLOCKSS — $550-$18,350/yr scaled to library budget; 20 years operational

CLOCKSS charges $550-$18,350 per year, scaled proportionally to library materials budget for libraries and to journal/ebook revenue for publishers. The consortium has operated continuously since 2006 — twenty years — across 12 mirror nodes serving 300 supporting libraries in 14 countries, with 691 publisher partners and 81 triggered-content titles released to the open community after publisher failure.

The price structure illustrates the surviving-consortium pattern in C-0030: proportional fees keep participation rational at small institutions (the $550 floor is below a single departmental software license at most universities) while still aggregating enough total revenue from large institutions to fund the consortium's coordination cost. CLOCKSS is the canonical example of a Tier 2 pricing model that has run for two decades without the funding-model collapse that ended DPN (E-0054) and MetaArchive (E-0055).