> Their mother had held on to the comic books since she and her brother bought them between the Great Depression and the beginning of World War Two, Heritage said.

It seems unlikely that in that time frame it would have been a 5 digit purchase. It still may have been a significant proportion of liquid cash or net worth though. I think it'd be an interesting detail to have too.

It came out in 1939, which is in that time frame, so she probably bought it at a newsstand for the 10 cent cover price. I could be mistaken, but I don't think there was any real second-hand market for comic books at the time.