Gary T,I suggest you run an EBay search. But then the Gladstone reissues are still the same Carl Barks or Don Rosa art and stories. There is nothing quit as pleasing to a comic collector like myself than having that 1957 Four Color in your hands. Or re-reading Tales to Astonish 44 (First appearance of The Wasp in an Ant-man comic) and remembering where you first read it as a kid. In my case it was 'tween innings during a Saturday pickup game of ball.
Go to a comic convention in your area and ask about. There is a con in Ithaca NY this week end which is probably where I'll be for part of the day.
Don