Need to find

Might be worth a shot.

http://search.barnesandnoble.com/booksearch/isbnInquiry.asp?r=1&ISBN=9780764316319&ourl=Collectors%2DGuide%2Dto%2DBus%2DToys%2Dand%2DModels%2FKurt%2DM%2DResch&cm_mmc=Shopzilla-_-Category-_-Title-_-9780764316319&mr:referralID=d2a4b9bd%2D10df%2D11df%2Da274%2D000423bb4e79

The closest you will find are the Arii Bonnet Buses in 1/32.  The issue with them is they are Japanese and have the entry door on the left side, as opposed to a US school bus which has one on the rt side.  You could probably cut the door section out and relocate it to the rt side though.  I have thought about doing the same.

Arii Bonnet Bus at HLJ

Another option is to scratch/convert one using the above-mentioned Opel Blitz kit.  There is an article in the May 1990 FSM where Lewis Pruneau did it to show a Cambodian bus covered and filled with riders called, "Standing Room Only".  It is on the front of the mag.

Good luck.

Some of the Japanese companies do buses in 1/32. Have a look here and see if anything appeals.

http://www.hlj.com/hljlist2/?Word=bus&Scale=0&MacroType=AutPas&GenreCode=Aut&searchpage=Auttop&Dis=-2

Unfortunately I need a modern bus.

The only thing close to a 1/35 school bus I can think of is the old Airmodel conversion for turn an Opel Blitz into a bus.  This would, however be a late-30's style bus.