These books dont change much year to year, I would suggest checking it out from the library, they have them all... and its free.
Libraries still exist? Youd think theyd all be shut down now.
Yeah I have their books on Management consulting (called something like Top Management Consulting firms, or something) and also have their guides on Case interviews and finance interviews. The editions that I have are relatively old.
They are pretty good, though I am not sure whether the contents have really changed over the years.
Vault guides are good and so are the WetFeet guides.