More stuff:
Taken Knex 30 model building set. Is missing some parts, but most, if not all, models can be built without them.
Taken Thames and Kosmos Physics Workshop. Also missing a few pieces, but they are nonessential and most, if not all, of the experiments can be done without them. Not in original box.
Taken Erector motorized ferris wheel set The motor for this is missing, but there are still lots of pieces if your kids like erector sets.
Supermag Speed Similar to the one pictured, but makes three different vehicles, not in original box.
Taken Icoaster magnetic roller coaster Has all the parts, not in original box.
Taken Chaos Tower Missing a few nonessential parts, not in original box.
Oooh, this is fun!