Though I bumped this topic to tell you that The Phantom Tollbooth in now available from The Warner Archive Collection!:
http://www.wbshop.com/Phantom-Tollbooth-The/1000181484,default,pd.html?cgid=ARCHIVENEW
Do note, DVDaf says it will be available from the Archive Collection on November 30th, so it safe to say that this is a mistake.