You may want to zoom in for this. This is a panel from an Allied Electronics catalog detailing all the acetate blanks they have for sale. Most of them are Audiodisc and Presto brands. The cheapest were paper-core discs at only 20 center per disc. The most expensive were their 17.5-inch "Master Discs" at a whopping $3.40 each. I've never seen one. The generic available was Knight, a brand I've also never seen.
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