Is there a Public Works garage nearby that has a recycling container for corrugated cardboard? The folks who pick up at the curb here will take the corrugated stuff, but you have to package it in a no larger than 2' x 2' size. That's a pain to have to fold it down, so we take ours down the road to the town garage which has a HUGH dumpster designed to dump off the cardboard, and you can put large, flattened pieces in it.
Yeah there is a place. I have not been there in a while but I seem to recall it being over by Hawkeye downs on the SW side. Off the 33rd st exit, right, left just passed the taco bell, on the right side just passed the junkyard. I might be remembering wrong though.