Hello, Molly. Here are my thoughts. I live in Wisconsin, so my thoughts are impacted by prices for tools I've seen here.
The band saw was the one I had the most difficulty finding anything about. My suspicion is that $400 would be the top end of what you could reasonably expect for the saw. If your husband had a larger collection of band saw blades you were selling with it, particularly wider blades, you might be able to go a bit higher. This appears to be an old saw, but a well-built one.
Is the Dewalt 790 a table saw or a radial arm saw? I apologize if I'm over-explaining but I don't know how much you know about tools themselves. A table saw would have a flat top with the blade coming up out of an opening in that top. A radial arm saw has a long swing arm that the saw motor and blade hang down from. I believe the 790 is a radial arm saw. If so, I'd suggest pricing it at $150 and being happy to get $100 from it. I sold a 10" Craftsman radial arm saw about three years ago for $75 and was happy to have done so. You might be able to go a bit higher since this is a 12" saw, so maybe list it at $200 and see what happens.
I don't have much knowledge of the Delta Rockwell wood shaper. Looking at a few pictures I could find, I suspect you'd be doing well to get $100 for it. If your husband had several different cutting blades for it, maybe a bit more here as well.
The scroll saw is likely the least valuable of the tools. I'd suggest listing it at $75 and taking $50.
The clamps and wood likely require a bit more information to offer a suggestion on. It really depends on what you have. Most woodworkers will never admit to having too many clamps or too much wood. I believe for both you'd get a better price selling on Craigslist or Facebook Marketplace than in an auction for example. Both should sell easily in Pennsylvania, though.
It appears from this reply that you can drag and drop picture files into the box right below the reply screen to attach files to the message. Please try that and upload pictures of the clamps and wood. For the wood, take pictures of both the faces of the boards and the ends of the boards. Seeing the end-grain helps to identify wood. I'm not an expert on wood by any means, but can give you my best guess. If that doesn't work, reply here and let me know. I'll send you my email address so you can send them directly.
One other suggestion, I don't know how comfortable you are with having strangers over to sell the tools. I suggest that you only accept initial replies by email so that you can take your time in responding and not get pushed into a place where you're not comfortable. Craigslist is especially good for this as you reply through Craigslist so email addresses aren't shared unless you choose to do so. Don't post your exact address in a listing either. There are people using any of the online selling sites who will try to steal from you so be careful.
I hope this helps.