The APMUC cards seem to be reasonably common as they show up regularly on eBay, though their final sale prices can vary drastically - currently hovering around $300-400. Less common is the more desirable 100MHz DayStar PowerPro 601, which was also offered by Sonnet after Daystar's demise as the Sonnet Presto PPC 700.
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Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.