There is a small collection on Arthur's Bookshelf (SciFi, Shelf 2) in HTML format
http://arthursbookshelf.com/bookshelf.html . If Ralph Sir Edward's list is correct I think all those are ok in Life + 50 countries (which, for the sake of keeping good order, I'll mention that includes me).
So there are a few around for eBook hunting hounds who know the crannies of the internet to sniff around in, and who live in Life + 50 countries.
I have just checked and the Blackmask CD can also be found too, but if it is anything like mine (which hails from around 2002, as I was collecting ebooks way back then

) each book is in .lit and .htm format and no covers; they were primitive times eBook-wise. There are around 140 Doc Savage books on my CD, I have not checked every one but they seem to be fine now for those of us in Life + 50 countries.