I just broke down and ordered a year subscription to Marvel Digital Comics. I went back to some of the earlier Amazing Spider-man issues and although the art is the same they have re digitised them with new colour as they are not the dotted colour fills off old.
So what does my $58 for a year get me? over 9,000 comics!
You can't download them and you have to view them online but the comic reader is very well done allowing you to read the entire page or frame by frame.