>>9842152Target carries them. Next to the NanoBots or BattleBots stuff. I picked up 2 of the large cases a couple years ago. They're fun, but some of the connections you have to force pretty hard.
>>9842171Yeah it's literally sold in a "dumpster" of random parts. Neat gimmick
>>9845499They are around 4 inches after completing a usual build. You could possibly keep going higher, but stability would be affected.