It used to be much easier. In IE all I did for years was go to the fiile menu and click "save as" to save the whole page.
Then Ebay did some script thing that means you don't get the pictures.
Alt + print screen copies everything that's currently visible, which can then be pasted into something like Paint. From there it can be cropped etc or simply saved as-is.
I don't do it for record keeping, but for saving images of stuff that interests me but that I can't afford or sometimes just didn't bid high enough.
Steve B