I'm not familiar with this list of inexpensive astro bodies. Sure you can get a used 60a but inexpensive is relevant, isn't it?
Here’s what I’m thinking of. These aren’t conventional camera bodies (they don’t have viewfinders, etc.), but they have cooled chips for long exposures and other capabilities for deep-sky astrophotography.
Cameras like these didn’t exist when the D60a was introduced, so I’m just saying that the world of astrophotography has largely moved beyond the need for uncooled DSLRs.