I was in WH Smiths and saw that the newest issue (33) of Batman Legends contains the whole 'Whatever Happened To the Caped Crusader?' two parter by Neil Gaiman for £2.60.
The only other way to get this (outside of finding the original issues) is in the trade which is £10.87 on amazon and £18.99 rrp. That collection has some other issues included but the only links they have to this story are the character and author.
Also included is Battle of the Cowl #1, but that's not much of a draw.