I really do have to wonder if anyone's actually *sold* an Apollo DN xxxx memory card for *any* price in the last... few years? Seriously, they seem to be a machine that *nobody* loves anymore. (The last non-spam posts in the comp.sys.apollo newsgroup were in 2008, and there were all of three of them.)

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You could always ask over on the Classic Computers email list. See if anyone there has any DN xxxx machines in their collection and what the memory market looks like. If any group has an obscure Apollo collector in it, it's probably that email list.

I bet I could prototype one of those memory cards for less than $300, depending on how hard it is to find that connector.

Actually, I bet one could be built for under $100, again, depending on the connector.

From the photo it looks like it is just eight sets of nine 1M X 1 memory chips and a very few other chips for control, as one would expect in a composite memory module. Might even be able to build one with 8M X 1 chips and dispense with the extra logic.