[Highland Park] lego star wars ATAT set for sale

I got my son this set last Christmas.  It's pretty awesome...over 1100 pieces, a battery pack so the completed ATAT (all terrain armored transport) can move around, etc.  The problem is that the legos are not separated into bag 1, 2, etc. so finding the pieces is somewhat tedious and beyond my son's (and my) patience level.  The box is open but complete, and I have somewhat sorted the pieces.  It would be a good match for an older child or adult, or a really patient younger child.  I paid $125 for the set, and will sell for $75.