Yep, they're $300 bux... but when you gotta have the right box car you just gotta have the right box car!
1942 AAR 40'double door "auto" cars:
http://www.protocraft.com/category.cfm?Categoryid=41
1944 AAR 40' "postwar" box car with 4/4 "Improved Dreadnaught" ends:
http://www.protocraft.com/category.cfm?Categoryid=42
Really significant car for the anti "The Atlas or Athearn box cars are just fine for me" crowd. Lots and lots of roads had these: