Does anyone know where I can find a Sig Kadet Senior, 80" wing span NEW in the box?

You must be talking about the "ARF" which is 80" and has ailerons, because the kit is only 78" and does not have ailerons. The "ARF" is my slow park flier. This being my favorite mess around plane. I can take off 5', and do a split S in a 75' flight box.

To answer your question.................Tower has the blue and whites ones in stock at the moment. Look under ARF trainers .20-.50 I believe. Better get one quickly as they have been out for a long time and they just came back in.

Call Sig and ask them if they have received any ARF's of late.....there was a long time when they couldn't get 'em in the country.