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Was blundering around looking for HP3000-adjacent info as one does and ran into this from 1988, which gives a cost of $3000 to $5000 for mastering and pressing costs of $3 to $10 per disc. dl.acm.org/doi/10.1145/...
dl.acm.orgThe laserROM project: a case study in document processing systems | Proceedings of the ACM conference on Document processing systems