The Collectibles Shop has back issue Silver, Bronze and (mostly) Copper/Modern Age DC comic books for sale, well below guide prices. All are Near Mint, first prints, complete, unless noted. A few Batman hardcover graphic novels for under cover price too.
Pictured is the Famous 1st Edition #F-4, reprints 1st Captain Marvel in Whiz Comics from 1940. Near Mint- 9.2, for $30.